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Question

Which of the following is a test cross?
  1. Ww × ww
  2. WW × ww
  3. ww × WW
  4. All of the above

A
Ww × ww
B
All of the above
C
ww × WW
D
WW × ww
Solution
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A cross between two organisms, one of which has an unknown genotype and the other with a homozygous recessive trait is called a test cross. This cross was first performed by Gregor Mendel and is used to detect the unknown genotype of a particular organism. Hence it is a valuable tool in genetics. In all the given options the cross involves a homozygous recessive genotype ww. Thus the correct answer is option D.

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