Populations live in rapidly changing environments—droughts come and go, food sources change, human activities reshape habitats. For scientists, this raises a fundamental puzzle: How do populations ...

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Genes code for proteins (nearly all of the time). So in some cases, the dominant allele is one that actually does code for the protein, while the recessive one does ...

A: Genes work in pairs. Every person inherits two copies of most genes, one from each parent. Some gene variants, called dominant alleles, express themselves even when only one copy is present. Others ...

In Mendelian inheritance patterns, you receive one version of a gene, called an allele, from each parent. These alleles can be dominant or recessive. Non-Mendelian genetics don’t completely follow ...

Smile dimples aren't caused by a dominant gene — a biologist explains the muscle quirk behind them, and two surprising body parts that work the same way.