Dominant alleles a. usually cause the underproduction of an ...

[cdr_15]

Dominant alleles
 
  a. usually cause the underproduction of an enzyme.
  b. always produce the most desirable phenotype.
  c. can mask the expression of other alleles at the same locus.
  d. are always the most common allele in a population.
  e. were discovered by Charles Darwin.

Question 2

Two people (BOTH heterozygotes) are able to taste a chemical substance called PTC. The ability to taste PTC is caused by a dominant allele (T). The inability to taste PTC is caused by a recessive allele (t). What proportion of their children would be expected to have the tt genotype?
 
  a. 3/4
  b. 1/2
  c. All
  d. 1/4
  e. 2/3

[tennis14576]

Answer to Question 1

C

Answer to Question 2

D