The Xer site-specific recombination system
a. is needed to allow segregation of nonrecombined daughter chromosomes.
b. is inactive during the process of bacterial cell division.
c. generates a single dimeric molecule.
d. is needed to resolve the product of a general recombination between copies of the bacterial chromosome.
e. is required to correct mutations generated during DNA replication.
Ans: d
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Average human males are most likely to be attracted to women with a waist to hip ratio of 0.72. Women with this waist to hip ratio are also the most fertile. By being attracted to women with a waist to hip ratio, a male is increasing his chances of having children and thus improve his ____ .
A. longevity B. gene flow C. fitness D. allele frequency
The prevalence of the allele for sickle cell anemia in some populations is an example of?
A. Heterogeneous environments B. Balancing selection C. Inverted selection D. Non-Darwinian selection E. Nonrandom mating
What is the purpose of isolating pure cultures?
What will be an ideal response?
Pollen grains develop in which structure?
a) the anther b) the stigma c) the filament d) the carpel