Walid Mawass
@wmawass.bsky.social
Evolutionary geneticist. I think about evolution across timescales and constraints on it from interactions at each scale. I use both population and quantitative genetics to do science. I love music, writing, and my cats (order varies on a daily basis).
Fellow evo-bio folks of BlueSky! 🧬
New preprint out — based on work from my PhD (yes, Chapter 3!) — where I ask:
👉 How predictable and consistent are evolutionary responses to selection in natural populations?
Preprint: tinyurl.com/mr3r5vk3 #evolution #microevolution #quantitativegenetics #preprint
New preprint out — based on work from my PhD (yes, Chapter 3!) — where I ask:
👉 How predictable and consistent are evolutionary responses to selection in natural populations?
Preprint: tinyurl.com/mr3r5vk3 #evolution #microevolution #quantitativegenetics #preprint
Contrasting evolutionary outcomes in a human life history trait which is heritable and under consistent unbiased directional selection
Microevolution is well documented in natural populations, yet its persistence as an adaptive process remains debated. Despite widespread directional selection on heritable traits, including life-histo...
tinyurl.com
October 15, 2025 at 2:43 PM
Fellow evo-bio folks of BlueSky! 🧬
New preprint out — based on work from my PhD (yes, Chapter 3!) — where I ask:
👉 How predictable and consistent are evolutionary responses to selection in natural populations?
Preprint: tinyurl.com/mr3r5vk3 #evolution #microevolution #quantitativegenetics #preprint
New preprint out — based on work from my PhD (yes, Chapter 3!) — where I ask:
👉 How predictable and consistent are evolutionary responses to selection in natural populations?
Preprint: tinyurl.com/mr3r5vk3 #evolution #microevolution #quantitativegenetics #preprint
Reposted by Walid Mawass
Excited for our publication on how the geographic scale of a sample affects the discovery of rare, deleterious variants to be out this week. With a mix of theory, simulation, and data analysis, we show when samples are narrow vs broad, the number of variants discovered and their frequencies change
PNAS
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans...
www.pnas.org
June 5, 2025 at 5:55 PM
Excited for our publication on how the geographic scale of a sample affects the discovery of rare, deleterious variants to be out this week. With a mix of theory, simulation, and data analysis, we show when samples are narrow vs broad, the number of variants discovered and their frequencies change
Reposted by Walid Mawass
We are excited to share our new preprint describing the inclusion of selection models to stdpopsim, our community-maintained library with an extensive catalog of population genetic models. 1/n
www.biorxiv.org/content/10.1...
www.biorxiv.org/content/10.1...
www.biorxiv.org
March 24, 2025 at 4:47 PM
We are excited to share our new preprint describing the inclusion of selection models to stdpopsim, our community-maintained library with an extensive catalog of population genetic models. 1/n
www.biorxiv.org/content/10.1...
www.biorxiv.org/content/10.1...
Reposted by Walid Mawass
Our latest paper revisits Haldane 1957 on speed limits to adaptation, the paper that triggered neutral theory. We clarify and then significantly extend the theory, and apply the resulting model to @mexpositoalonso.bsky.social's data doi.org/10.1093/gene... 1/14
Substitution load revisited: a high proportion of deaths can be selective
Abstract. Haldane's Dilemma refers to the concern that the need for many “selective deaths” to complete a substitution (i.e. selective sweep) creates a spe
doi.org
March 19, 2025 at 10:58 PM
Our latest paper revisits Haldane 1957 on speed limits to adaptation, the paper that triggered neutral theory. We clarify and then significantly extend the theory, and apply the resulting model to @mexpositoalonso.bsky.social's data doi.org/10.1093/gene... 1/14
Reposted by Walid Mawass
This week’s Research-In-Progress meeting features Walid Mawass (@wmawass.bsky.social), postdoctoral scholar in the Berg Lab at the University of Chicago!
Research-In-Progress is a venue for the NITMB community to discuss planned or in-progress work
Research-In-Progress is a venue for the NITMB community to discuss planned or in-progress work
March 12, 2025 at 7:01 PM
This week’s Research-In-Progress meeting features Walid Mawass (@wmawass.bsky.social), postdoctoral scholar in the Berg Lab at the University of Chicago!
Research-In-Progress is a venue for the NITMB community to discuss planned or in-progress work
Research-In-Progress is a venue for the NITMB community to discuss planned or in-progress work
Reposted by Walid Mawass
How does the quality of pedigrees impact genetic studies? Based on genealogical data, bigger and deeper pedigrees improve precision, but even small errors skew results! Our work highlights the need for careful sensitivity analyses:
doi.org/10.1093/jeb/...
@wmawass.bsky.social and E. Milot
doi.org/10.1093/jeb/...
@wmawass.bsky.social and E. Milot
Assessing the impact of pedigree attributes on the validity of quantitative genetic parameter estimates
Abstract. Investigating the evolution of complex traits in nature requires accurate assessment of their genetic basis. Quantitative genetic (QG) modeling i
doi.org
February 25, 2025 at 5:00 PM
How does the quality of pedigrees impact genetic studies? Based on genealogical data, bigger and deeper pedigrees improve precision, but even small errors skew results! Our work highlights the need for careful sensitivity analyses:
doi.org/10.1093/jeb/...
@wmawass.bsky.social and E. Milot
doi.org/10.1093/jeb/...
@wmawass.bsky.social and E. Milot
I truly don't understand the whole "report on your work, or get fired". These people were EMPLOYED! They didn't go into the government saying "I'll be doing this job then". They applied to a job ad that DESCRIBES their job duties and they were HIRED because someone judged them to be a good fit 🤦🏾♂️
February 23, 2025 at 1:00 AM
I truly don't understand the whole "report on your work, or get fired". These people were EMPLOYED! They didn't go into the government saying "I'll be doing this job then". They applied to a job ad that DESCRIBES their job duties and they were HIRED because someone judged them to be a good fit 🤦🏾♂️
This is scary for the sheer illegality of these actions that the administration is taking and the jeopardy it puts people's life in! These employees can't even rely on their unions if the admin can just ignore unions outright!
www.reuters.com/world/us/us-...
www.reuters.com/world/us/us-...
US science agency reclassifies hundreds of workers as probationary, US lawmaker says
National Science Foundation administrators reclassified hundreds of employees from permanent to probationary status in violation of labor contracts, according to a U.S. lawmaker and agency employee.
www.reuters.com
February 22, 2025 at 12:09 AM
This is scary for the sheer illegality of these actions that the administration is taking and the jeopardy it puts people's life in! These employees can't even rely on their unions if the admin can just ignore unions outright!
www.reuters.com/world/us/us-...
www.reuters.com/world/us/us-...
🥳My work on the reliability of pedigrees used in quantitative genetic estimations of the genetic basis of phenotypic trait is out now in @jevbio.bsky.social! It also serves as a good intro for the use of pedigrees to infer genetic signals of phenotypes in populations
academic.oup.com/jeb/advance-...
academic.oup.com/jeb/advance-...
Assessing the impact of pedigree attributes on the validity of quantitative genetic parameter estimates
Abstract. Investigating the evolution of complex traits in nature requires accurate assessment of their genetic basis. Quantitative genetic (QG) modeling i
academic.oup.com
February 4, 2025 at 6:50 PM
🥳My work on the reliability of pedigrees used in quantitative genetic estimations of the genetic basis of phenotypic trait is out now in @jevbio.bsky.social! It also serves as a good intro for the use of pedigrees to infer genetic signals of phenotypes in populations
academic.oup.com/jeb/advance-...
academic.oup.com/jeb/advance-...
This is good news! Even if not all demands were met, this is a clear demonstration of scientists ceizing the power to negotiate over compensation for their labor to the academic scientific enterprise. Add to it that the negotiations were with the government directly!
www.science.org/content/arti...
www.science.org/content/arti...
NIH postdocs, graduate students win union contract
Historic deal will boost researcher pay—if Congress provides funding
www.science.org
January 12, 2025 at 8:49 PM
This is good news! Even if not all demands were met, this is a clear demonstration of scientists ceizing the power to negotiate over compensation for their labor to the academic scientific enterprise. Add to it that the negotiations were with the government directly!
www.science.org/content/arti...
www.science.org/content/arti...
Easy one! Vice(2018)...Doesn't even need explaining for those who have seen it!
What’s a good movie that makes a strong political or moral point?
December 28, 2024 at 9:52 PM
Easy one! Vice(2018)...Doesn't even need explaining for those who have seen it!
In my case, I would say it is "The Metamorphosis" by Franz Kafka.
What are people's most ARCHETYPICAL novels? Not your FAVORITES per se, but the ones that best exemplify your tastes in novels, distilled into a single work?
Mine is probably Susanna Clarke's "Jonathan Strange & Mr Norrell."
Mine is probably Susanna Clarke's "Jonathan Strange & Mr Norrell."
December 28, 2024 at 1:52 AM
In my case, I would say it is "The Metamorphosis" by Franz Kafka.
Has anyone done research using data from human pops? I am trying to decide on a choice of representative figure for my paper. Should I pick one of the type of data (a picture of a civil act used to recreate social genealogies) or a picture of possible subjects of the human population in question?
December 18, 2024 at 6:01 PM
Has anyone done research using data from human pops? I am trying to decide on a choice of representative figure for my paper. Should I pick one of the type of data (a picture of a civil act used to recreate social genealogies) or a picture of possible subjects of the human population in question?
It is without a doubt that academic research environments are shaping into a structured labor environment (grad researchers, postdoctoral researchers, staff scientists, principal investigators...). Therefore, it is no surprise that unionization is becoming prevalent.
December 12, 2024 at 11:45 PM
It is without a doubt that academic research environments are shaping into a structured labor environment (grad researchers, postdoctoral researchers, staff scientists, principal investigators...). Therefore, it is no surprise that unionization is becoming prevalent.
Reposted by Walid Mawass
We identified protein domains in LUCA (Last Universal Common Ancestor). Their distinctive amino acid usage reveals the order amino acids were added to the genetic code, based mostly on size. Older proteins hint at earlier alternative codes. 1/15 @seekingluca.bsky.social www.pnas.org/doi/10.1073/...
Order of amino acid recruitment into the genetic code resolved by last universal common ancestor’s protein domains | PNAS
The current “consensus” order in which amino acids were added to the genetic code
is based on potentially biased criteria, such as the absence of s...
www.pnas.org
December 12, 2024 at 3:43 PM
We identified protein domains in LUCA (Last Universal Common Ancestor). Their distinctive amino acid usage reveals the order amino acids were added to the genetic code, based mostly on size. Older proteins hint at earlier alternative codes. 1/15 @seekingluca.bsky.social www.pnas.org/doi/10.1073/...
First layer of snow in Chicago! Hoping for snow to last a little longer this year than the last.
November 21, 2024 at 1:39 PM
First layer of snow in Chicago! Hoping for snow to last a little longer this year than the last.
Reposted by Walid Mawass
I am recruiting graduate students this year to join my lab in Tucson! If you are interested in studying the evolution of plant diversity, polypoidy, and chromosomal evolution, please reach out about opportunities in my lab! Details about applying to EEB and our new CAMBIUM NRT in the thread below! 🧪
If you are looking for a graduate program in Ecology & Evolutionary Biology, please considering joining us in Tucson, AZ! Our deadline is December 2 this year for admission to our Fall 2025 cohort. You can find out more about EEB and applying to our program here: eeb.arizona.edu/graduate/pro...
November 14, 2024 at 6:44 PM
I am recruiting graduate students this year to join my lab in Tucson! If you are interested in studying the evolution of plant diversity, polypoidy, and chromosomal evolution, please reach out about opportunities in my lab! Details about applying to EEB and our new CAMBIUM NRT in the thread below! 🧪
Reposted by Walid Mawass
If you are looking for a graduate program in Ecology & Evolutionary Biology, please considering joining us in Tucson, AZ! Our deadline is December 2 this year for admission to our Fall 2025 cohort. You can find out more about EEB and applying to our program here: eeb.arizona.edu/graduate/pro...
November 14, 2024 at 6:36 PM
If you are looking for a graduate program in Ecology & Evolutionary Biology, please considering joining us in Tucson, AZ! Our deadline is December 2 this year for admission to our Fall 2025 cohort. You can find out more about EEB and applying to our program here: eeb.arizona.edu/graduate/pro...
Beautiful scenes from the NZ parliament! It's more than just anti-colonialism...it is about showing the colonial vestiges that native practices are alive and well, and will continue to be employed as a sign of continuous resistance. Even inside of a parliamentary body!
November 14, 2024 at 3:45 PM
Beautiful scenes from the NZ parliament! It's more than just anti-colonialism...it is about showing the colonial vestiges that native practices are alive and well, and will continue to be employed as a sign of continuous resistance. Even inside of a parliamentary body!
WELP! I am starting to get to the point where instead of partitioning time across different analyses for my research projects, I am partitioning time towards all the writings I need to get done!!! is that a good sign? a bad sign?
November 14, 2024 at 3:37 PM
WELP! I am starting to get to the point where instead of partitioning time across different analyses for my research projects, I am partitioning time towards all the writings I need to get done!!! is that a good sign? a bad sign?
I've been enjoying @zotero.bsky.social as my main publication reader! Especially the addition of the dark theme and the new box that pops up when you hover over a citation!
One feature I wish was there though is to allow fetching that reference directly instead of having to open another browser tab!
One feature I wish was there though is to allow fetching that reference directly instead of having to open another browser tab!
November 13, 2024 at 3:59 PM
I've been enjoying @zotero.bsky.social as my main publication reader! Especially the addition of the dark theme and the new box that pops up when you hover over a citation!
One feature I wish was there though is to allow fetching that reference directly instead of having to open another browser tab!
One feature I wish was there though is to allow fetching that reference directly instead of having to open another browser tab!
Reposted by Walid Mawass
Genomics, evolution, and more starter pack!
Help build community with this starter pack.
This list is currently incomplete. Want to be included? Reply and I will remedy that!
go.bsky.app/JjvzkWU
Help build community with this starter pack.
This list is currently incomplete. Want to be included? Reply and I will remedy that!
go.bsky.app/JjvzkWU
November 10, 2024 at 8:27 PM
Genomics, evolution, and more starter pack!
Help build community with this starter pack.
This list is currently incomplete. Want to be included? Reply and I will remedy that!
go.bsky.app/JjvzkWU
Help build community with this starter pack.
This list is currently incomplete. Want to be included? Reply and I will remedy that!
go.bsky.app/JjvzkWU
It's been a while since I've posted on this app! To commemorate restarting my posting activity, here's a cute eye bleach content courtesy of our feline twins.
November 11, 2024 at 2:51 PM
It's been a while since I've posted on this app! To commemorate restarting my posting activity, here's a cute eye bleach content courtesy of our feline twins.
Reposted by Walid Mawass
Our new preprint changes the way we look at an “extinction vortex” in which a small population loses fitness, causing it to become even smaller.
doi.org/10.1101/2024...
@wmawass.bsky.social @uliseshmc.bsky.social 1/n
doi.org/10.1101/2024...
@wmawass.bsky.social @uliseshmc.bsky.social 1/n
Extinction vortices are driven more by a shortage of beneficial mutations than by deleterious mutation accumulation
Natural populations are increasingly at risk of extinction due to climate change and habitat loss and fragmentation. The long-term viability of small populations can be threatened by an extinction vor...
doi.org
October 30, 2024 at 11:25 PM
Our new preprint changes the way we look at an “extinction vortex” in which a small population loses fitness, causing it to become even smaller.
doi.org/10.1101/2024...
@wmawass.bsky.social @uliseshmc.bsky.social 1/n
doi.org/10.1101/2024...
@wmawass.bsky.social @uliseshmc.bsky.social 1/n
Our boy with another banger sleeping position. He looks like he is ready to kitty launch!
November 23, 2023 at 1:40 AM
Our boy with another banger sleeping position. He looks like he is ready to kitty launch!