Which of the following activities could lead to a decrease in the genetic diversity in the gene pool of a species?
A. an increase in the reproductive rate, which results in increased population size
B. a decrease in the size of the population from millions to hundreds
C. the absence of mutations
D. the species switches from asexual reproduction to sexual reproduction
B. a decrease in the size of the population from millions to hundreds
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. If a mammalian species that lives in an area with harsh winters and mild springs and summers has a gestation length of five months, when would you expect mating to occur? Assume implantation and pregnancy immediately follow mating.
A. late winter B. mid-summer C. late fall D. early spring E. mid-spring
In this representation of transcription, the first
genetic word of RNA is
a. ATG. b. ATA. c. UAU. d. GUG. e. AUG.
Which is the most muscular and powerful chamber of the heart?
A. right atrium B. left atrium C. right ventricle D. left ventricle
__________ are proteins, Y-shaped antigen receptors made only by __________ cells.
Fill in the blank(s) with the appropriate word(s).