Recombination occurs
a. during prophase I and II and involves swapping of chromosome fragments between all 4
chromatids.
b. only during prophase I and involves swapping of chromosome fragments between
homologous chromatids.
c. only during prophase I and involves swapping of chromosome fragments between sister
chromatids.
d. during prophase I and II and involves swapping of chromosome fragments between sister
chromatids.
e. during prophase I, prophase II, and prometaphase; it involves exchange of alleles between
homologous chromosomes.
B
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A colony of mice is treated with a nonvirulent strain of the bacterium Streptococcus pneumoniae. Before treatment, a
researcher exposed this nonvirulent strain to heat-killed cells of a virulent strain. What will be the effect on the mouse population?
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A. source B. biotic community C. reservoir D. exchange pool E. none of these