In generalized transduction, a phage introduces a segment of donor DNA into the recipient cell. This is followed by recombination of the donor fragment with the recipient chromosome. Which of the following must occur?
A) circularization of the donor fragment before recombination
B) a pair (or even number) of crossovers between the donor segment and the recipient
C) degradation of one of the two strands of phage genome
D) replication of the donor segment before recombination
E) a single crossover between the donor segment and the recipient chromosome
B
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What characteristic of short tandem repeats (STRs) DNA makes it useful for DNA fingerprinting?
A) The number of repeats varies widely from person to person or animal to animal. B) The sequence of DNA that is repeated varies significantly from individual to individual. C) The sequence variation is acted upon differently by natural selection in different environments. D) Every racial and ethnic group has inherited different short tandem repeats.
Mycorrhizal fungi interact with plants at the
A. cuticle. B. edge of ponds. C. stomata. D. seed coat. E. roots.
Two bird species compete in the forest for the same seeds. If ? = 0.75 and ? = 0.25, then (assuming the same carrying capacity for both)
A) the rate of seed consumption is the same for both species. B) the environment can supply both species since the sum of competition coefficients equals 1. C) species 1 "wins" and will outcompete species 2. D) species 2 "wins" and will outcompete species 1.
Which of the graphs below depicts a genotype x environment interaction?
A. (b) B. (c) C. (a) D. all graphs depict a genotype x environment interaction