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 ...

There’s no simple answer, because genetics is complicated and many traits — such as eye colour — are influenced by many genes Why are some genes dominant? Such as those for brown eyes over blue eyes, ...

Just because a trait is dominant does not mean it is common. Each color represents different levels of light eyes. Blue=80%+, teal=50-79%, olive=20-49%, brown=1-19%, black=none. Image courtesy of Dark ...

As Mendel observed over a century ago, the manifestation of a phenotype can crucially depend on the dominant–recessive relationship between alleles at a given locus. A study of plant ...

In general, humans have the same genes. A number of genes are varied. These control our physical traits and health. Each variation is called an allele. You inherit two alleles for each gene. One comes ...

Genes come in pairs – ­one coming from your ­father and one from your mother – and can be ­described as being either dominant or recessive. A dominant gene is said to be “strong” and will always have ...

Classic osteogenesis imperfecta, an autosomal dominant disorder associated with osteoporosis and bone fragility, is caused by mutations in the genes for type I collagen. A recessive form of the ...

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