Analyze Population Data for Evolution Practice Test

A lizard population includes two toe-pad phenotypes: large pads (helpful on smooth rocks) and small pads. Researchers tracked phenotype frequencies for 15 generations after a new smooth-rock habitat became common.

Generation 1: 40% large, 60% small

Generation 5: 55% large, 45% small

Generation 10: 73% large, 27% small

Generation 15: 81% large, 19% small

Which interpretation best fits the data?

In a beetle population, body color is either green or brown. The frequencies of the two color phenotypes were recorded over 30 generations.

Generation 0: 92% green, 8% brown

Generation 10: 70% green, 30% brown

Generation 20: 41% green, 59% brown

Generation 30: 18% green, 82% brown

Which conclusion is best supported by the data?