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Question

Dihybrid test cross involves crossing of F1 dihybrid to

A
double recessive parent
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B
homozygous dominant parent
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C
double heterozygous dominant parent
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D
both a and c
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Solution

The correct option is A double recessive parent
Dihybrid test cross involves crossing of F1 dihybrid to double recessive parent.
Dihybrid test cross: YyRr X yyrr
Where , YyRr is yellow round seeds and yyrr is green wrinkled seeds.
The gametes formed are : YR, Yr, yR,yr
Thus when a F1 dihybrid (YyRr) is crossed with a double recessive parent (yyrr), the offsprings obtained in the test cross is as follows:


YRYryRyryrYyRrYyrryyRryyrr(Yellow, round seeds)(Yellow, wrinkled seeds)(Green, round seeds)(Green, wrinkled seeds)
Hence, the dihybrid test cross ratio is
YyRr : Yyrr : yyRr : yyrr = 1 : 1 : 1 : 1.

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