All calico cats are female because:a

two recessive X-linked genes are required for the calico phenotype.
b. Y-linked genes prevent the expression of the calico phenotype.
c. the calico phenotype is caused by random X chromosome inactivation.
d. the calico phenotype is a Y-linked trait.
e. one X chromosome and one Y chromosome are needed for the expression of the calico phenotype.


c

Biology & Microbiology

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Fill in the blank(s) with the appropriate word(s).

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A gene pool is

A. the genes that are unique to a species. B. all the genes in a population. C. all the similar genes in a gene family. D. a swimming hole for geneticists. E. a group of species that look alike but are not located in the same area at the same time.

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The tentacles of squids bear hooks, while those of octopus do not

Indicate whether the statement is true or false

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Species found in only one place on Earth are called ________ species

A) hot spot B) exotic C) keystone D) endemic

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