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  • Give reasons for the appearance of new combinations of characters in the F_{2} progeny.

Give reasons for the appearance of new combinations of characters in the F2 progeny.

Answers (1)

Law of independent assortment: This is the reason for the appearance of new combinations in the F2 generation. It states that:

When two pairs of traits are combined in a hybrid, one pair of characters segregates independently of the other pair of characters.
It indicates that the chances for the pea seeds to be round or wrinkled do not depend on their chances to be yellow or green.
Each pair of alleles is independent of the other pairs.

In a dihybrid cross between two plants having round yellow (RRYY) and wrinkled green seeds (rryy), four types of gametes are produced (RY, Ry, rY, ry). Each of these segregate independent of each other.

 

Gametes

RY

Ry

rY

ry

RY

RRYy

RRYy

RrYy

RrYy
 

Round Yellow

Round Yellow

Round Yellow

Round Yellow

Ry

RRYy

RRYy

RrYy

RrYy
 

Round Yellow

Round Yellow

Round Yellow

Round Yellow

rY

RrYy

RrYy

rrYy

rrYy
 

Round Yellow

Round Yellow

Wrinkled Yellow

Wrinkled Yellow

ry

RrYy

RrYy

rYy

rrYy
 

Round Green

Round Green

Wrinkled Green

Wrinkled Green

Progeny Ratio: Round Yellow: Round green: wrinkled Yellow  wrinkled green

9  :  3 :  3   1

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