The several hundred species of picture-winged fruit flies of the Hawaiian Islands are genetically very similar, yet they all differ markedly from their ancestral population in Asia. This is probably an example of _____
A. gene flow.
B. sexual selection.
C. directional selection.
D. founder effect.
E. disruptive selection.
D. founder effect.
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A biome characterized by warm, fairly dry climate that primarily contains grasses with scattered, isolated trees is a ________.
A. chaparral B. tundra C. temperate grasslands D. savanna
IS elements (insertion sequences) are stable DNA occupants of prokaryotic genomes that are not found among eukaryotes
Indicate whether the statement is true or false
Four of the following are features found exclusively among all vertebrates. Which one is the exception?
a. notochord
b. pharyngeal gill slits
c. four legs
d. post-anal tail
e. dorsal nerve cord
A(n) ________ has been used to estimate that humans began to wear clothing between 83,000 and 170,000 years ago
A) parsimony analysis B) outgroup comparison C) molecular clock