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Test cross is a cross between...

Test cross is a cross between

A

Hybrid `xx` Dominant parent (Tt `xx`TT)

B

Hybrid `xx` Recessive parent (Tt `xx` tt)

C

Hybrid `xx` Hybrid (Tt `xx` Tt)

D

All of the above

Text Solution

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The correct Answer is:
B
• It is clear that though the genotypic ratios can be calculated using mathematical probability, by simply looking at the phenotype of a dominant trait, it is not possible to know the genotypic composition.
• That is, for example, whether a tall plant from `F_(1)` or `F_(2)` has TT or Tt composition, cannot be predicted.
• Therefore, to determine the genotype of a tall plant at `F_(2)`, Mendel crossed the tall plant from `F_(2)` with a dwarf plant. This he called a test cross.
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