A testcross is performed on an individual to examine three linked genes. The most frequent phenotypes of the progeny were Abc and aBC, and the least frequent phenotypes were aBcand AbC. What was the genotype of the heterozygous individual that is test-crossed with the correct order of the three genes?
A. BAC/bac
B. Abc/aBC
C. bAc/BaC
D. aBc/AbC
E. bcA/BCa
Ans: E. bcA/BCa
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A. mutualism. B. parasitism. C. symbiosis. D. transient microbiota.
Newborn babies acquire microbiota by
A. passing through the birth canal. B. breastfeeding. C. contact with mother's skin. D. environment. E. All of the above are a source of microbiota.
Erection occurs when
A. the spongy erectile tissue of the penis becomes engorged with blood. B. the veins flowing out of the penis vasoconstrict. C. the arteries of the penis vasodilate. D. nitric oxide is released. E. All of these events occur to promote an erection.
When a species consisting of a single large population slowly evolves over many generations into a new species, this an example of
A. synapomorphy. B. horizontal gene transfer. C. cladogenesis. D. anagenesis. E. monospeciation.