Two Martians fall in love and marry. One Martian is homozygous for red eyes and the other is
heterozygous. The recessive eye color is purple. What is the probability that they will have a child with
purple eyes?
a. 1/1
b. 1/2
c. 1/4
d. 3/4
e. 0
E
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What would be the frequency of pink flowers in a population where the allele frequency of CR is 0.4 and the population is in Hardy-Weinberg equilibrium? Assume that CR CR is red, CRCW is pink, and CwCw is white?
A. 0.04 or 4% B. 0.16 or 16% C. 0.2 or 20% D. 0.8 or 80% E. 0.48 or 48%
In positional cloning, the researcher begins with a phenotype. To move toward identification of its DNA sequence, she must begin with what step?
What will be an ideal response?
Coat color in mice is determined by genes at two loci. When black mice from a particular population mate, they produce offspring in the following ratios: 9 black : 3 brown : 4 white. These results suggest that white coat color is expressed as a result of
(A) dominance (B) incomplete dominance (C) codominance (D) a sex-linked trait (E) epistasis
The majority of nitrogen in soil and marine environments is fixed by
a. free-living bacteria and archaea b. symbionts c. E. coli d. biofilm organisms e. UV light