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Question

A pea plant with yellow and round seeds (YYRR) is crossed with a pea plant having green and wrinkled (yyrr) seeds, then in F2 generation of this dihybrid cross, 320 plants are produced. Out of which 180 plants have same phenotypic characters. Identify this phenotype.

A
Yellow and wrinkled seeds
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B
Yellow and round seeds
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C
Green and round seeds
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D
Green and wrinkled seeds
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Solution

The correct option is B Yellow and round seeds
In a normal cross, we have the phenotypic ratio of 9:3:3:1, where offsprings are:
9 - Yellow round seeds
3 - Green round seeds
3 - Yellow wrinkled seeds
1 - Green wrinkled seeds
In 320 offsprings, 180 offsprings have the same phenotype, this states that these 180 plants have phenotype yellow and round seeds. This can be explained as follows:
x16×320=180
x=180×16320=9
So, 180 offsprings will have yellow and round seeds.

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