Evolutionary biology

Omar Cornejo and Joanna Kelley in their WSU lab

Spring 2018

It’s in the genes

When Omar Cornejo got his genomic analysis back from 23andMe, he and his wife, fellow population geneticist Joanna Kelley, were both a bit surprised and vindicated. Venezuelan, Cornejo expected to see the alleles, or variations of a gene, from Native American, western European, and North African populations. But he was unaware that his family’s deep history also included ancestors from sub-Saharan Africa.

That just goes to show the importance of broadly sampling the genome, says Kelley. “The lesson is that if you just look at the mitochondria, you’d assume this person is from Africa. But if you look at just the Y chromosome, you’d assume … » More …

Winter 2011

An evolutionary myth is dismissed

Even though a paper on guppy senescence by evolutionary biologist Donna Holmes and her colleagues has circulated for several years, the “grandmother hypothesis” still persists.

And understandably so. One of those rare feel-good stories from evolutionary theory, the grandmother hypothesis attempts to explain menopause in humans as an evolutionary adaptation. Menopause is adaptive, the argument goes, in the sense that women’s reproductive capacity is cut short barely two-thirds of the way through their lives so that the grandmother can help raise the grandchildren, thereby improving the survival of her lineage.

In spite of its appeal, however, “I’ve always thought that was a dumb theory,” … » More …