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Question: Answered & Verified by Expert
In rabbits, the gene for grey fur (G) is dominant over that for black fur (g). In a litter, if 50\% rabbits are grey, then the possible parental cross combination is
BiologyPrinciples of Inheritance and VariationAIIMSAIIMS 2015
Options:
  • A $\mathrm{GG} \times \mathrm{Gg}$
  • B $G G \times G G$
  • C $g g \times g g$
  • D $\mathrm{Gg} \times \mathrm{gg}$.
Solution:
2556 Upvotes Verified Answer
The correct answer is: $\mathrm{Gg} \times \mathrm{gg}$.
When heterozygous grey individuals $(\mathrm{Gg})$ are crossed with homozygous black individuals (gg), then grey and black individuals will be obtained in equal ratio. It is a type of test cross and can be illustrated as:

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