How is the distinctive fur pattern of a calico cat produced?

a. by X-chromosome inactivation
b. by hormones
c. by Y-chromosome inactivation
d. by epistasis


Ans: a. by X-chromosome inactivation

Biology & Microbiology

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Four of the five answers listed below pass through the atmosphere during their cycling. Select the exception

a. carbon b. oxygen c. nitrogen d. phosphorus e. water

Biology & Microbiology

All of the following are true of the process of

phosphorylation EXCEPT that a. a molecule gains a phosphate group. b. a molecule loses a phosphate group. c. molecules become less stable. d. it is used to prime molecules to react. e. it produces ADP from ATP.

Biology & Microbiology

The Punnett square is a useful tool for

A) determining the rate of segregation of alleles. B) calculating how many mutations occur during DNA replication. C) determining which genes or traits assort independently during gamete formation. D) predicting the ratios of possible genotypes of a particular combination of alleles. E) predicting the level of crossing over that will occur during meiosis.

Biology & Microbiology