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
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Organisms that directly reduce almost all of their pyruvate to lactate are called ________ fermenters.
Fill in the blank(s) with the appropriate word(s).
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.
The tentacles of squids bear hooks, while those of octopus do not
Indicate whether the statement is true or false
Species found in only one place on Earth are called ________ species
A) hot spot B) exotic C) keystone D) endemic