Answer questions 2-4 based on the fact that Peter has a garden pea plant in his
ID: 187496 • Letter: A
Question
Answer questions 2-4 based on the fact that Peter has a garden pea plant in his backyard. He names this garden pea plant "Gandalf" in the memory of his grandfather. Out of Peter's genetic study, he knows Gandalf produces smoothened pea and has the genotype Rr (R: smooth allele, and r: wrinkle allele) 2, Gandalf the garden pea plant (is, or is not) a true line for the trait of pea shape. 3. Peter intends to mate Gandalf the garden pea plant mates with a garden pea plant that produces wrinkle peas, whose genotype should be labeled as . 4. Peter predicts that when Gandalf the garden pea plant mates with the garden pea plant that produces wrinkle peas, 75% of the offspring would produce smooth pea, and 25% of the offspring would produce wrinkled pea 50% of the offspring would produce smooth pea, and 50% of the offspring would produce wrinkled pea 25% of the offspring would produce smooth pea, and 75% of the offspring would produce wrinkled pea A. B. C.Explanation / Answer
2. Gandalf is not a pure breeding line, as when mated with another plant of the same genotype, it will produce offsprings with different phenotypes.
3. Homozygous with wrinkly seeds is represented here by rr
4. The cross is between Rr and rr. 50% of the offsprings will inherit the R allele and produce smooth peas, and the rest 50% will produce wrinkled peas. Therefore, option B is correct.