6. You are interested in pea genetics, and so you are looking for interesting ph
ID: 187877 • Letter: 6
Question
6. You are interested in pea genetics, and so you are looking for interesting phenotypes from peas growing at nearby farms. Assume that wild-type peas have purple flowers. You have found peas at two different farms, each of which has white flowers. In each case, the white-flowered phenotype is recessive to purple flowers. You don't know whether the mutations in these two lines are in the same gene or in two different genes. You cross a white flowered plant from line 1 to a white flowered plant in line 2. Draw the cross, and describe what genotypes and phenotypes you would expect to observe in their progeny if: a. The two white-flowered peas have mutations in different genes (genes A and B) (1pt) b. The two white-flowered peas have mutations in the same gene (gene A) (1pt)Explanation / Answer
Given information,
Purple = Dominant = PP or Pp
White = Recessive = pp
It is given that two white flowered plants are identified in two different forms, we need to distinguish whether they are allelic to each other or not.
If both these mutations are allelic (Mutations in the same gene), we would get only white flowers in the F1 progeny if we cross these two plants.
pp X pp
Progeny: pp
If both these mutations are not allelic (Mutations in different genes), we would get purple flowers in the F1 progeny if we cross these two plants.
pp AA X PP aa
Progeny: PpAa
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