In pea plants, flower color is determined by gene P (allele P = purple; allele p
ID: 145663 • Letter: I
Question
In pea plants, flower color is determined by gene P (allele P = purple; allele p = red). Pollen shape is determined by gene L (allele L = long pollen; allele l = round pollen).
A plant heterozygous for the dominant purple allele (P) and heterozygous for the dominant long pollen allele (L) was crossed with a plant that was recessive for both traits.
The phenotypes seen in the offspring are shown:
Purple, long 47
Red, round 47
Purple, round 3
Red, long 3
Answer Choices:
Given the phenotypes of offspring obtained from the cross of pea plants in the previous question, which diagram correctly shows an arrangement of alleles of gene P and gene L at metaphase of meiosis I in the parent plant that is heterozygous at both genes?
Explanation / Answer
As parental combinations are much more than new combinations it clearly states that the genes are linked.
Therefore answer is(2) genes are present closely on same chromosome. Distance is less because distance is inversely related to linkage which means less is the distance more is the linkage.
2nd question. Option C is correct because linked genes are present on same chromosome and more offsprings have long and purple pollen therefore P and L are linked.