Fill in the blanks (dilution)

What field of science did harry hess study?

How does the study of genetic disorders such as pku biologists understand normal alleles?

What would be the result if crossing over did not happen during meiosis in humans? a. there would be less genetic variation in humans. b. parents would be more likely to look like their children. c. the human population could not reproduce. d. children would have more chromosomes.