Question

Mendel crossed a true-breeding plant that produced green seeds with a true-breeding plant that produced yellow seeds to produce an F1 generation. The entire F1 generation produced yellow seeds. Then he crossed the F1 offspring with each other to produce the F2 generation. From the F2 generation, he counted 6022 yellow seeds. What is a likely estimate of the number of green seeds he collected from the F2 generation?

Answer 1

The estimated number of green seeds in the F2 generation is 2007, approximately.

Step-by-step explanation:

Available data:

• Cross of a true-breeding plant that produced green seeds with a true-breeding plant that produced yellow seeds

• The entire F1 generation produced yellow seeds.

• Cross of the F1 offspring with each other to produce the F2 generation

• From the F2 generation, there were 6022 yellow seeds.

1st Cross:

Parental) YY x yy

gametes) Y Y y y

F1) 100% Yy

2nd Cross

Parental) Yy x Yy

Gametes) Y y Y y

Punnet square) Y y

Y YY Yy

y Yy yy

F2) 75% yellow, Y-

25% green, yy

What is a likely estimate of the number of green seeds he collected from the F2 generation?

From the whole F2 generation (100%), 75% are yellow seeds, which means that the remaining 25% are green seeds. According to this, 75% of the seeds, equal 6022 seeds. So we need to know how many seeds equal the 25% of green seeds. This is:

If 75% of the F2 generation ------- 6022 seeds

then 25% of the F2 generation -----X = 2007.333 seeds

The estimated number of green seeds in the F2 generation is 2007, approximately.