Reference no: EM132620717

1. You are studying fruit flies. You crossed a red-eyed female (XRXr) with a white-eyed male (XrY). Draw the Punnett square. What is the genotype ratio? What is the phenotype ratio?

2. Draw the pedigree diagram for the following family, assuming the sons to be XY and the daughters to be XX. Barney and Betty have five children, 2 daughters and 3 sons. The mother is a carrier of hemophilia, an X- linked disorder. She passes the gene on to two of the sons, who died in childhood, and one of the daughters, Jane, is also a carrier. Both daughters marry men without hemophilia, and they each have 3 children (2 boys and a girl). Jane has one son with hemophilia. One of the non-carrier daughter's sons marries a woman who is a carrier and they have twin daughters. What is the percent chance that each twin daughter will also be a carrier? (Draw a Punnett square to help answer this)

3. a) Based on this genetic map, which two genes are most strongly linked (least likely to undergo recombination)?

b) Based on this genetic map, which two genes are most weakly linked (most likely to undergo recombination)?

4. Through genetic experiments, Rosalind found that the genes for squash flower color (y), squash leaf size (b), and squash color (r) were all located on the same chromosome. She found that flower color seemed to be frequently linked to squash color, and less frequently linked to leaf size, while leaf size and squash color were only inherited together about 50% of the time. Based on these observations, draw a model for the order and locations of the genes on the chromosome (as in number 6).

5. Each of these pedigrees depicts a different family and a different trait. For each pedigree, is the trait depicted most likely recessive, dominant, X-linked, Y-linked, or mitochondrial (choose one)? Explain your answer.