A group of organisms sharing a derived trait is known as a ____
a. clade
b. taxon
c. tribe
d. community
e. population
ANSWER: a
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An allele is:
A. one of several forms of a gene. B. the particular combination of genes for a given trait in a given organism. C. the expression of a trait in an individual. D. the location of a gene on a chromosome. E. none of these.
A small marine amphipod has recently been discovered that carries a bad-tasting organism on its back, which is contrary to its normal behavior. If a fish ingests the pair, it immediately spits them back out. If the amphipod is alone, however, it is readily eaten. There is no apparent benefit or harm in this relationship for the "backpack" organism. This is probably a case of
A. competitive exclusion. B. mutualism. C. parasitism. D. commensalism.
The natural role of restriction enzymes in bacteria is to
A) make conjugation more efficient. B) allow transposons to move to another place in the chromosome. C) protect the cell from invading phages. D) allow cells to accept foreign DNA. E) provide the cell with new phenotypes, such as antibiotic resistance.
Which of the following is not a tenant of the Lyon hypothesis?
A) X inactivation occurs early in development. B) initial X inactivation is random. C) X inactivation is passed down during mitosis. D) X inactivation occurs on the maternal X chromosome. E) X inactivation of descendant cells is the same as the progenitor cell.