What happens if a Killer T cell gets taken over by a virus?

How are viruses and bacteria different?

Mutations associated with albinism affect proteins involved in synthesis

In a population that is in hardy-weinberg equilibrium, there are two possible alleles for a certain gene, a and a. if the frequency of allele a is 0.4, what fraction of the population is heterozygous? a. 0.40 b. 0.60 c. 0.16 d. 0.48