Ahypothetical population has two alleles for a gene: a and a. in a random sample of 50 individuals, 20 are homozygous for a, 10 are homozygous for a, and 20 are heterozygous. what is the frequency of a?

Which heredity condition causes a buildup of mucus in lungs and pancreas? a. cystic fibrosis b. heart disease c. huntington's disease d. sickle cell anemia

Cells control gene expression at which steps

Prokaryotic and eukaryotic cells are different in many ways other than the presence or absence of a nucleus. if both archaebacteria and eubacteria are prokaryotic cells, then why are archaebacteria more closely related to eukaryotic cells than they are to eubacteria?