Usually, an egg cell from a human female contains
a. one X chromosome and one Y chromosome.
b. one X chromosome.
c. one Y chromosome.
d. two X chromosomes.
e. two Y chromosomes.
B; During meiosis the two X chromosomes segregate, therefore, one X is found in each egg.
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The agent of microevolutionary change that is most likely to introduce genetic variation from another population is
referred to as ____.
a. genetic drift b. gene flow c. natural selection d. mutation e. nonrandom mating
When the predator population is below the prey isocline, the prey population is
a. increasing b. decreasing c. neither increasing nor decreasing
One of the laws Mendel established is the law of independent assortment. Assume that a parent has the genotype Aabb and that this parent produces gametes. Which of the following illustrates the letter or letters that could be present in one of these gametes according to the law of independent assortment?
A) AB B) ab C) A D) Aa
The biological concept of species requires that
A) organisms reproduce sexually. B) individuals are able to reproduce outside the group. C) only asexual reproduction occurs. D) geographic isolation occurs. E) organisms are morphologically similar.