Question

You've discovered a new plant species in which

yellow fruit color (Y) is dominant to green fruit color (y), and

round fruit shape (R) is dominant to long fruit shape (r).

The genes for fruit color and shape are located on the same chromosome and are 12 m.u. apart.

Determine the proportions of progeny of each phenotype produced for this cross.

Yr/yR x yr/yr

Reset

Help

0%

6%

12%

25%

44%

50%

75%

88%

100%

1. yellow, round:100%

2. yellow, long:0%

3. green, round:0%

4. green, long:0%

Incorrect; Try Again; 2 attempts remaining

Answer 1

It is given that the two genes are found to be apart at 12 map unit. This suggests that there is found 12% recombination. There is found 12% recombinant gametes and 88% parental gametes.

Since there are two recombinant and two parental gametes. That's why the following gametes are found which is seen in the punnet square.

Parents: Yr/yR × yr/yr

Gametes	yr
Yr (44%)	Yr/yr yellow, long fruit 44%
yR (44%)	yR/yr green, round fruit (44%)
YR (6%)	YR /yr Yellow, Round fruit (6%)
yr (6%)	yr/yr green, long fruit (6%)

1. yellow, round:6%

2. yellow, long:44%

3. green, round:44%

4. green, long:6%

please rate.