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Pregnancy In Mammals Evolved with Help from Roving DNA

Written by: Kate Baggaley
Narrated by: Mark Moran
Length: 1 min
Categories: Science & Math

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Publisher's Summary

Roving pieces of DNA helped early mammals ditch egg-laying in favor of giving birth to live young. These “jumping genes,” or transposable elements, flipped the switch on thousands of genes, turning off ones that build hard eggshells and turning on ones that allow a fetus to develop in the uterus.
©2015 Science Service (P)2015 Science Service

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