How many haploid cells are produced by one diploid cell during meiosis?
A) 8 million B) One C) Four D) Two
C
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Multigene families arise from _____
a. a single gene duplication event b. repeated cycles of gene duplication followed by mutation
c. single point mutations d. exon shuffling e. deletions of genes
What mutations occurred in typical icefish that prevented production of hemoglobin?
A. fragmentation of both the alpha and beta genes B. deletion of the alpha gene and fragmentation of the beta gene C. deletion of both the alpha and beta genes D. fragmentation of the alpha gene and deletion of the beta gene E. destruction of red blood cells in the bone marrow
Although artificial selection may seem slow and unreliable, ____________________ observed that after only a few
generations, breeders produced many varieties of pigeons and minks Fill in the blank(s) with the appropriate word(s).
The average time to death from starvation in a fruit fly is about 20 hours. Selecting for increased starvation resistance in fruit flies:
a) can produce populations in which the average time to death from starvation is 10 hours. b) has no effect because it is too complex a physiological process, dependent upon the effects of too many genes. c) can produce populations in which the average time to death from starvation is 160 hours. d) has little effect because constant mutation reduces starvation resistance, counteracting any benefits from selection. e) has no effect because it is a not a trait that influences fruit fly fitness.