Question

in the following crosses write the characteristics of the progeny
a) RRYY * RRYY
b) RrYy * RrYy
c) RRYY * rryy

Answer 1

The characteristics of the progeny are as follows.
(a)RRYY X RRYY
Their gametes will be similar. RY and RY. Therefore all of their progenies will be  RRYY (round yellow). It is dominant character.
(b) RrYy X RrYy
Their gametes will be RY, Ry, rY, ry from both parents. Therefore their progenies will be in 9:3:3:1 ratio (9 round yellow: 3 round green: 3 wrinkled yellow: 1 wrinkled green).
(c) RRYY X rryy
Their gametes will be RY and ry. Their progeny will be RrYy (all the offsprings). 

Answer 2

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A) RRYY × RRYY

➜ In the first condition given, the gametes will be same that is RY. Hence, the progeny's genotype will be RRYY and the phenotype will be Round and Yellow.

B) RrYy × RrYy

➜ In the second condition given, the gametes will be RY, Ry, rY, ry from both the parents. Hence, the progeny will be in the ratio 9 : 3 : 3 : 1. That is, 9 of them is round and yellow, 3 of them are round and green, three of them are wrinkled and yellow and one is wrinkled and green.

C) RRYY × rryy

➜ In the last condition given, the gametes will be RY and RY from the first parent and ry and ry from the second parent. And all the progeny will be RrYy.

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Please refer to the image attached.

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