In humans, the genetic basis for determining the sex "male" is accomplished by the presence of ________

A) high levels of estrogen
B) a balance between the number of X chromosomes and the number of haploid
C) a portion of the Y chromosome
D) multiple alleles scattered throughout the autosomes
E) one X chromosome
F) sets of autosomes


Answer: C

Biology & Microbiology

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Over generations in a population, individuals with higher fitness values will

A. become less prevalent due to natural selection against them. B. become more prevalent. C. stay at the same frequency in the population. D. become less prevalent due to their having less stamina. E. become less prevalent due to natural selection against them and become less prevalent due to their having less stamina are correct.

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Referring to the above diagram, what structure

is labeled "D"?

a. the appendix b. the cecum c. a polyp d. a portion of the small intestine e. the colon

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When bones of a joint slip out of places, it is known as _____

a. a sprain b. a strain c. arthritis d. a dislocation e. a break

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How many copies of a specific allele does a gamete cell have?

a. 1 b. 2 c. 23 d. 46 e. 92

Biology & Microbiology