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?

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# Brief Explanations:
- For $LLRR\times llrr$:
    - Parent 1 ($LLRR$) can only produce $LR$ gametes.
    - Parent 2 ($llrr$) can only produce $lr$ gametes.
    - Offspring genotype: $LlRr$ (long pods, round peas).
- For $LLRr\times LlRr$:
    - Parent 1 ($LLRr$) can produce $LR$ and $Lr$ gametes.
    - Parent 2 ($LlRr$) can produce $LR$, $Lr$, $lR$, $lr$ gametes.
    - Offspring genotypes: $LLRR$, $LLRr$, $LLrr$, $LlRR$, $LlRr$, $Llr$ (all with long pods and round peas as long - pod ($L$) is dominant and in all cases $L$ is present, and for pea shape, even if there is $r$ allele, as long as $R$ is present (from $RR$ or $Rr$), it's round).
- For $Lirr\times llrr$:
    - Parent 1 ($Lirr$) can produce $Lr$ and $lr$ gametes.
    - Parent 2 ($llrr$) can produce $lr$ gametes.
    - Offspring genotypes: $Llr$ (long pods, wrinkled peas) and $llr$ (short pods, wrinkled peas). So this is incorrect as not all offspring have round peas.
- For $LLrr\times llRR$:
    - Parent 1 ($LLrr$) can produce $Lr$ gametes.
    - Parent 2 ($llRR$) can produce $lR$ gametes.
    - Offspring genotype: $LlRr$ (long pods, round peas).

# Answer:
A. $LLRR\times llrr$, B. $LLRr\times LlRr$, D. $LLrr\times llRR$

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