The 14 species of Darwin's finches on the Galapagos Islands mainly differ in:
a) body size.
b) tail length.
c) song type.
d) coloration.
e) bill size.
Answer: e) bill size.
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According to the multiregional model,
a. Homo erectus populations migrated out of Africa. b. Homo erectus evolved further in regions beyond Africa. c. Homo erectus populations gave rise to races of Homo sapiens. d. Homo sapiens subpopulations originated in several separate locations. e. all of these are true.
Place the following events of bacterial conjugation in order from first to last.1-DNA replication2-an enzyme joins F factor DNA ends3-sex pilus shortens4-DNA transfer5-an enzyme cuts F factor DNA
A. 5, 1, 3, 4, 2 B. 1, 2, 3, 4, 5 C. 3, 5, 4, 2, 1 D. 3, 5, 1, 2, 4 E. 3, 5, 1, 4, 2
A genetic signature for positive selection is
A) a gene sequence present in humans and other primates, but with at least one amino acid difference in the encoded protein in humans. B) a gene that is unique to humans. C) a gene sequence present in humans and other primates, but with no amino acid sequence differences. D) a gene that encodes a protein that makes the individual more sexually attractive.
Sexual reproduction
a. leads to uniform characteristics in a population. b. results in new combinations of genetic traits. c. produces genetic clones. d. requires less tissue differentiation than asexual reproduction. e. only requires mitosis.