Question

(Work out the mendel's dihybrid cross taking seed shape and seed colour as two characteristic to be considered) .........(class10th) (ch=9) (NCERT) (heredity and evolution) (ch name)




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Answer 1

RY - Round Yellow seeds

ry - wrinkled green seeds

Ry - Round green seeds

rY - wrinkled Yellow seeds

Answer 2

Answer:

Let us take example between plants with round and green seeds and those with wrinkled and yellow seeds. The genotype of round and green seeds is RRyy and that of wrinkled and yellow seeds is rrYY. In the F1 generation, all plants produced round and yellow seeds; which means that wrinkled texture and the green colour of seeds was the recessive character . When plants of F1 generation were allowed to self pollinate; it was observed that most of the plants in F2 generation produced round and yellow seeds. Some plants produces round green seeds, some produced wrinkled yellow seeds and some produced wrinkled green seeds. The ratio was 9 : 3 : 3 : 1; as shown in the figure.

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