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Question

In garden pea, yellow colour of cotyledon (Y) is dominant over green colour (y) and round seed shape (R) is dominant over wrinkle (r). A heterozygous yellow round seeded plants for both the traits is self-pollinated, then the ratio of yellow wrinkle would be

A
9/16
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B
1/4
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C
3/16
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D
1/16
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Solution

The correct option is C 3/16
Given :
Y (yellow) is dominant over green (y) colour and round (R) is dominant over wrinkle (r).
YyRr is self pollinated. Therefore, the cross will be YyRr x YyRr
Gametes formed will be : Yr. Yr, yR, yr and Yr. Yr, yR, yr
F1 generation will consists of : YYRR, YYRr, YyRR, YyRr, YYrR, YYrr, YyrR, Yyrr, YYRR, yYRr, yyRR, yyRr, yYrR, yYrr, yyrR, yyrr.

Therefore, 9 will show the Y and R phenotypes.
3 will show the Y and rr phenotypes.
3 will show the yy and R phenotypes.
1 will show the yyrr phenotype.
Genotype of yellow wrinkle seeds will be Y_rr. Therefore YYrr, Yyrr, Yyrr shows yellow wrinkled seeds. Hence, the ratio is 3/16.

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