You are given two true breeding lines, one produces white flowers and one produc

Question

You are given two true breeding lines, one produces white flowers and one produces purple flowers. You cross the lines and all F1’s are purple. You cross the F1’s with themselves and in your F2 generation observe a mixture of purple and white flowering plants. About 56% of your F2 plants make purple flowers and 44% make white flowers. Provide a detailed hypothesis explaining this result including your proposed genotypes for the original lines, the F1’s and the F2’s. You are given two true breeding lines, one produces white flowers and one produces purple flowers. You cross the lines and all F1’s are purple. You cross the F1’s with themselves and in your F2 generation observe a mixture of purple and white flowering plants. About 56% of your F2 plants make purple flowers and 44% make white flowers. Provide a detailed hypothesis explaining this result including your proposed genotypes for the original lines, the F1’s and the F2’s.

Explanation / Answer

Anwer

Two pure breeding lines produce white (ww) and purple flowers (WW). When a cross is performed the resulting offspring were all purple flowers.

Parents: ww x WW

Gametes: w and W

F1: wW (purple)

All the F1 generation is purple offsprings.

When the F1 are Crossed among them, the F2 generation had a mixture of white and purple flowering plants.

F2 generation: 3 purple and 1 white

1 (ww), true breeding recessive white,

2 (wW), non-true breeding dominant purple

1 (WW), true breeding dominant purple.

Random combination of gametes results in the 3:1 ratio that Mendel observed in the F2 generation.

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