Consider three species (1, 2, and 3). It's known that species 1 and 3 were separated 10 million years ago based on geologic measurements
Genetic analysis at a neutral locus indicates that these species differ by 100 substitu-tions. If there are 10 substitutions separating species 1 and 2, how long ago did they diverge?
a. 0.1 million years ago
b. 1 million years ago
c. 10 million years ago
d. 100 million years ago
e. cannot be determined based on the information provided
B
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All the following are plant adaptations to low temperatures, except
A) shedding leaves at the onset of cold weather. B) production of antifreeze molecules. C) a shifting of Topt. D) increased photosynthetic rate to heat leaves.
The molecular defect in sickle cell anemia is known to reside at the position ____________________
of the ____________________ globin Fill in the blank(s) with the appropriate word(s).
The fossil Lucy (Australopithecus afarensis) is significant because, at _____ years old, hers is the first species to _____
A. 20 million; have been fully bipedal B. 1.3 million; have hominin brow ridges C. 3.2 million years; be fully bipedal D. 1.3 million; migrate out of Africa E. 600,000; have homin brow ridges