1)Describe the evolutionary benefit of meiosis. Include a basic description of crossing over and the evolutionary benefit. 2)In a lab a student counts corn kernal phenotypes to learn about heredity. He looks at two genes: one is for color, where the presence of the dominant allele, "P", deposits anthocyanin in the aleurone of the seed, causing a purple color. The recessive form of the allele, "p", disrupts coloration and allows the yellow endosperm beneath to be seen. The second gene controls the starch content of seeds, which can make the seed appear round in the dominant condition "R", or wrinkled in the recessive form, "r". The ear of corn being studied is advertised to be a cross between two plants that are heterozygous for both traits.

a) List the genotypes of the parents.

b)List the combinations of alleles that they can pass in their gametes.

c) What is the phenotype ratio of their offspring? Draw a Punnett Square to show your work. Take a picture of your Punnett square- show work

3) Red-gree colorblindness is a human disorder that is due to a se-linked recessive allele. This disorder occurs almost entirely in males.

a. Why do sex-linked recessive traits occur more frequently in males compared to females? BE SPECIFIC.

b. If Ariana is heterozygous for this condition and Tom is not colorblind, what is the probability that they will have a son that is colorblind? (Show your work on your scratch paper)