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Ivenika [448]
3 years ago
6

Draw a chart showing the crossing between red and white flowered pea plants till F2 generation. Find out the genotypic and pheno

typic ratio of F2 generation. When the mating of black and white rats takes place, all the offspring produced in first generation are black. Why there are no white rats?
Computers and Technology
1 answer:
adelina 88 [10]3 years ago
3 0

Answer:

part 1

F1 cross -

RR * rr

Rr, Rr, Rr, Rr

F2 Cross

Rr * Rr

RR, Rr, Rr, rr

Part 2

Black is dominant over white

Explanation:

Let the allele for red color trait be R and white color trait be r

Red is dominant over white

Genotype of true breeding parents

Red - RR

white - rr

F1 cross -

RR * rr

Rr, Rr, Rr, Rr

All the offspring are red and of genotype Rr

F2 Cross

Rr * Rr

RR, Rr, Rr, rr

RR: Rr: rr = 1:2:1

Phenotype ration

red (RR, Rr) : white (rr)

3:1

part 2

Black is dominant over white

hence, in first generation cross all mice become white

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