A summer squash plant that produces disc‑shaped fruit is crossed with a summer squash plant that produces long fruit. All of the F1 have disc‑shaped fruit. When the F1 are intercrossed, F2 progeny are produced in the ratio 9/16 disc‑shaped fruit, 6/16 spherical fruit, 1/16 long fruit. Give the genotypes of the F2 progeny.

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28-05-2020
Biology

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A summer squash plant that produces disc‑shaped fruit is crossed with a summer squash plant that produces long fruit. All of the F1 have disc‑shaped fruit. When the F1 are intercrossed, F2 progeny are produced in the ratio 9/16 disc‑shaped fruit, 6/16 spherical fruit, 1/16 long fruit. Give the genotypes of the F2 progeny.

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Phoca Phoca · Answer 1 · 2020-06-01T07:20:41+02:00

Explanation:

In the given question,

suppose allele A and a determines the color of the fruit whereas allele B and b determines the shape of the fruit.

The genotype for white, disc shape fruits is- AABB

the genotype for yellow, long fruits is- aabb

F1 progeny will be- AABB x aabb

AaBb

F2 cross- AaBb x AaBb

AB Ab aB ab

AB AABB AABb AaBB AaBb

Ab AABb AAbb AaBb Aabb

aB AaBB AaBb aaBB aaBb

ab AaBb Aabb aaBb aabb

The genotype of F2 cross are-

1. 9/16 A- B- disc-shaped (like F1)

2. 3/16 A- bb spherical

3. 3/16 aa B- spherical

4. 1/16 aa bb long.

Histrionicus Histrionicus · Answer 2 · 2022-02-08T14:34:10+01:00

The genotypes we get from this cross are:

9/16 A- B- disc-shaped - AABB, 2 AABb, 2 AaBB, and 4 AaBb

3/16 A- bb spherical - AAbb, and 2 Aabb

3/16 aa B- spherical - 2 aaBb, aaBB

1/16 aa bb long - aabb

Dihybrid cross

a mating between two organisms that are identically hybrid for two traits

Given:

Allele A and a determine the color of the fruit
Allele B and b determine the shape of the fruit.
The genotype for white, disc shape fruits - AABB
the genotype for yellow, long fruits - aabb

Solution:

F1 progeny will be- AABB x aabb

AaBb

F2 cross- AaBb x AaBb

Gametes: AB Ab aB ab

AB Ab aB ab

AB AABB AABb AaBB AaBb

Ab AABb AAbb AaBb Aabb

aB AaBB AaBb aaBB aaBb

ab AaBb Aabb aaBb aabb

The genotypes we get from this cross are:

9/16 A- B- disc-shaped - AABB, 2 AABb, 2 AaBB, and 4 AaBb

3/16 A- bb spherical - AAbb, and 2 Aabb

3/16 aa B- spherical - 2 aaBb, aaBB

1/16 aa bb long - aabb

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