Question

two pea plants are crossed to make 1,000 offspring. all offspring possess long pods and round peas. long pods (l) are dominant to short pods (l), and round peas are dominant (r) to wrinkled peas (r). which of the following are possible genotypes of the parent plants? correct answer(s)

Explanation:

Step1: Analyze dominant - recessive traits

Long pods (L) are dominant over short pods (l) and round peas (R) are dominant over wrinkled peas (r). All offspring have long pods and round peas.

Step2: Consider possible parent genotypes

For the pod - length trait, parents must have at least one L allele each to produce all long - pod offspring. For the pea - shape trait, parents must have at least one R allele each to produce all round - pea offspring.

Step3: Evaluate each option

• Option Llr × llr: There is a chance of getting short - pod offspring (ll), so this is incorrect.
• Option LLrr × llRR: All offspring will be LlRr, having long pods and round peas.
• Option LLRr × LLRr: All offspring will have long pods (since both parents have LL) and most will have round peas, but there is a small chance of getting wrinkled - pea offspring (rr), so this is incorrect.
• Option LLRR × llrr: All offspring will be LlRr, having long pods and round peas.

Answer:

LLrr × llRR, LLRR × llrr