When an allele's effect on a trait is masked by that of an allele paired with it, the second allele is
referred to as
a. dominant.
b. recessive.
c. codominant.
d. incompletely dominant.
e. hybrid.
B
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In a small population of cockroaches living in your kitchen, only a few roaches mate in one year. This can lead to random changes in allele frequency in the population through ______
A. nonrandom mating. B. selection. C. genetic drift. D. mutation. E. migration.
In flowering plants, how many egg cells are typically produced from each megaspore mother cell?
a. one b. two c. three d. four e. eight
Mutations in genes that affect __________ may cause morphological shifts in a lineage. Fill in the blank(s) with the appropriate word(s)
When Mendel crossed heterozygotes for flower color and seed color, what proportion of the offspring had both dominant phenotypes?
A) 1/3 B) 3/4 C) 1/16 D) 3/16 E) 9/16