NOVA

Switching Genes On and Off

Clip | 4m 54s

This video segment adapted from NOVA reveals how "junk" DNA helped solve an evolutionary mystery: Why do certain species of fruit flies have wing spots while others don't?

Aired: 03/09/10

Expired: 11/09/12

Rating: NR

Problems Playing Video? | Closed Captioning

Major funding for NOVA is provided by the NOVA Science Trust, the Corporation for Public Broadcasting, and PBS viewers.

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