What's up in
A Billion Years Before Sex, Ancient Cells Were Equipped for It
Molecular detective work is zeroing in on the origins of sexual reproduction. The protein tools for cell mergers seem to have long predated sex — so what were they doing?
Mating Contests Among Females, Long Ignored, May Shape Evolution
Showy male competitions over mating privileges have grabbed scientists’ attention more often, but new work hints that sexual selection is also widespread among females.
Catherine Dulac Finds Brain Circuitry Behind Sex-Specific Behaviors
Catherine Dulac is overturning preconceptions about “male” and “female” instincts and opening new avenues to treating postpartum depression.
How to Design (or at Least Model) Mixed Dog Breeds
Readers simulated the genetics of dog breeding to solve a puzzle about mixed breed percentages and sexual reproduction.
How to Breed a Pomsky and Other Questions About Dogs and Sex
Solve a puzzle about mixed dog breeds, sexual reproduction and the COVID-19 pandemic.
Choosy Eggs May Pick Sperm for Their Genes, Defying Mendel’s Law
The oldest law of genetics says that gametes combine randomly, but experiments hint that sometimes eggs select sperm actively for their genetic assets.