Four of the five answers listed below are related by a common phase of mitosis. Select the exception
a. chromosomes align at the spindle equator
b. sister chromatids become individual chromosomes
c. centromeres divide
d. the chromosomes move apart
e. spindle microtubules shorten, pulling chromosomes toward the poles
A
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Gut symbionts are lost after each molting a termite undergoes
Indicate whether the statement is true or false.
Suppose there is (hypothetical) evidence that a gene in mice produces a substance that induces twitchiness in hind leg muscles. A female mouse of a true-breeding twitchy strain is mated with a male of a true-breeding non-twitchy strain
All progeny are twitchy. Which of these procedures would you use to provide evidence for your hypothesis that twitchiness is due to mtDNA? A) Sequence the mtDNA of the twitchy mother. B) Breed twitchy male progeny with normal females to show no paternal inheritance. C) Breed twitchy female with twitchy male F1 mice to verify there is maternal inheritance. D) Backcross twitchy female offspring with normal fathers. E) Sequence the mtDNA of the twitchy male offspring.
In his monohybrid crosses for seed color in peas, Mendel reported 6,022 yellow seeds and 2,001 green seeds. How many of each color class were expected?
A) 4,011 green and 4,011 yellow B) All should be green C) All should be yellow D) 6,017 yellow and 2,006 green E) 2,006 yellow and 6,017 green
Fraternal twins
A. must be of the same sex. B. can be of the same sex. C. must be of different sexes. D. are always of the same sex.