Question

2. In garden peas, long stems are dominant to short stems, and yellow seeds are dominant to green seeds.

a. State the genotype of the two parental phenotypes
b. If long stem, yellow pea plants, are bred with a short green plant what do you expect the first generation (F1) offspring plants to look like?
c. Write the genotypes and phenotype of the offspring (F1).
d. Now cross two F1 plants from above, what is the phenotype of the next generation of plants. Please show your work by doing a dihybrid cross and writing the expected ratio of phenotypes.

Answer 1

In garden peas, long stems are dominant to short stems, and yellow seeds are dominant to green seeds. 100 long/yellow pea plants, all of which had one short/green parent, are interbred (bred to each other). 1600 progeny result. Please answer the following questions about these progeny. a. Assuming that these two genes are unlinked, about how many long/green pea plants would you expect to find among the offspring? b. What ratio of yellow to green seed color would you expect among the offspring? c. What would you expect the overall phenotypic ratio among the 1600 offspring to be (taking into consideration both traits)