Sentences with phrase «swordtail fish»

In the Calnali River in Mexico, two pure species of swordtail fish live side by side with a third population that's a mix of the original two.

For Molly Schumer, a postdoctoral fellow in genetics and evolutionary biology at Harvard Medical School, the fellowship will help fund her research on how evolutionary forces affect our genes, focusing in particular on a persistent trait that can cause melanoma in swordtail fish.

Not exact matches

To see if the presence of UV signals mattered to female swordtails or Mexican tetras, the investigators put the fish in aquariums with illumination that mimicked natural underwater light conditions and filters that either blocked or permitted UV light.

Unlike the majority of fish in which females lay eggs that are later fertilized by males, live - bearers — which include species such as mollies, platies, guppies, swordtails and mosquitofish — have internal fertilization.