Why is there natural selection for reduced parasitic bacterial genomes?
a. The parasitic lifestyle eliminates metabolism leading to gene loss.
b. Parasites have reduced metabolic needs leading to gene loss.
c. Parasitic bacteria are primitive and never had metabolic genes.
d. Transposons have caused mutagenesis and genes have been lost.
B
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Based on the figure below, how many groups (clusters) of Hox genes does each type of animal have?
A. Mammals: 4 groups; Flatworms: 4 groups; Sponge: 2 groups; Anemones: 1 group.
B. Mammals: 4 groups; Flatworms: 4 groups; Sponge: 1 groups; Anemones: 2 group.
C. Mammals: 11 groups; Flatworms: 4 groups; Sponge: 1 groups; Anemones: 4 groups.
D. Mammals: 27 groups; Flatworms: 4 groups; Sponge: 2 groups; Anemones: 1 group.
E. All animals must have at least 2 groups because all animals have a posterior and anterior end.
Functionally, the two most closely associated senses are
a. sight and hearing. b. touch and sight. c. taste and smell. d. temperature and pain. e. touch and balance.
What process provides the genetic variability that natural selection acts on during evolution?
a. adaptation b. artificial selection c. fitness d. mitosis e. mutation
Which factor does not affect temperature variation among geographic locations?
A) latitude B) proximity to water C) elevation D) longitude