If a person is a carrier of a certain allele, they can pass on the allele
but do not show the trait in their phenotype. For example, a carrier of
hemophilia will not exhibit the disease, but he or she can pass the
disease allele to his or her offspring. We would say that a carrier is...
A. homozygous dominant
B. heterozygous
C. homozygous recessive
D. monozygotic

b is the correct answer

in the year 2850, humans successfully colonized mars. the martian modules that were constructed could hold only a small population of people. it is now a century later, and the population on mars has grown to 600 people. of the current mars population, 45 people express the recessive phenotype for phenylketon- uria (pku) syndrome (pp genotype).

explanation: