Selective Sweeps

Genomic insights unlocked: adaptive divergence of Capsella bursa-pastoris across altitudinal gradients

Evolution in fast-forward: How thale cress adapts – or goes extinct

Researchers tracked genetic changes in Arabidopsis thaliana across 30 sites over five years, finding most populations adapted to local environmental conditions. However, some populations went extinct due to genetic drift, highlighting the importance of preserving biodiversity.

Genetics of attraction: mate choice in fruit flies

Research reveals that female fruit flies pre-select for males with superior genes before influencing sperm storage to ensure compatible fertilization. The study provides new insights into the mechanisms and consequences of mate choice, shedding light on genetic variation and species evolution.

Birds of a feather do flock together

Researchers used genetic evidence to explain how different species of capuchino seedeaters acquired distinct patterns of coloration. Soft selective sweeps were found to be the primary cause of these differences, driven by changes in environment and sexual selection.

New research challenges Darwin, shows how a gene cheats Mendel's law of segregation

A team of geneticists found that the R2d2 gene distorts cell division, leading to fewer offspring and violating Darwin's principle of natural selection. The discovery has implications for fields like basic biology, agriculture, and human health.

Digesting milk in Ethiopia: A case of multiple genetic adaptations

A team of geneticists identified five different alleles in the Ethiopian population that cause adult lactase production, highlighting a soft selective sweep. This phenomenon allows individuals to digest milk via different mutations, increasing their chances of survival under scarce food conditions.

Subtle shifts, not major sweeps, drove human evolution

A new international study found that classic selective sweeps may have played a smaller role in human evolution than thought. Researchers analyzed nearly 200 human genomes and found that smaller changes in multiple genes may have been the primary driver of human adaptation.