A solution to Darwin's 'mystery of the mysteries' emerges from the dark matter of the genome
Monday, October 26, 2009 - 13:21
in Biology & Nature
Biological species are often defined on the basis of reproductive isolation. Ever since Darwin pointed out his difficulty in explaining why crosses between two species often yield sterile or inviable progeny (for instance, mules emerging from a cross between a horse and a donkey), biologists have struggled with this question.