In violets, purple is dominant to white and tall stems are dominant to short stems. ....

In violets, purple is dominant to white and tall stems are dominant to short stems. . A tall purple plant that is heterozygous at both loci is crossed with a double homozygous recessive plant. What is the probability of obtaining either a tall white plant or a short purple plant? What percent of the offspring are expected to be heterozygous at one or both loci? What will be the expected ratio of the F2 offspring of the F1 generation?

Solutions

Expert Solution

Let's first stablish the allele letters: P for Purple and p for white, T for Tall and t for short.

And now let's write down the genotypes for the parents:

Parent 1: PpTt

Parent 2: pptt

- What is the probability of obtaining either a tall white plant or a short purple plant?

Let's make the punnet square:

	PT	Pt	pT	pt
pt	PpTt (purple, tall)	Pptt (purple, short)	ppTt (white, tall)	pptt (white, short)

The probability for a white-tall is 1/4, and for a purple-short is 1/4 too, so the probability for either of them is the sum of those probabilities:

1/4 + 1/4 = 1/2 = 50%

- What percent of the offspring are expected to be heterozygous at one or both loci?

There are 3 out of 4 that have one or both heterozygous loci: PpTt, Pptt and ppTt. That is 3/4 which is 75%

- What will be the expected ratio of the F2 offspring of the F1 generation?

Not sure what this question talks about, maybe to obtain an F2 from the F1 we already created, but it doesn't specifies which F1 genotypes we are going to cross. Let us cross the double heterozygous. The punnet square is:

	PT	Pt	pT	pt
PT	PPTT	PPTt	PpTT	PpTt
Pt	PPTt	PPtt	PpTt	Pptt
pT	PpTT	PpTt	ppTT	ppTt
pt	PpTt	Pptt	ppTt	pptt

This leads to the following ratios:

Purple-tall: 9/16

Purple-short: 3/16

White-tall: 3/16

White-short: 1/16

gladiator answered 1 year ago

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