Suppose red colour allele is not completey dominant over white colour allele encoding for fur colour in guineapig. If a red colour guineapig is crossed with white colour guineapig, it produces pink coloured guineapig.If two such pink coloured guineapig are crossed, what is the expected offspring?
Question
Suppose red colour allele is not completey dominant over white colour allele encoding for fur colour in guineapig. If a red colour guineapig is crossed with white colour guineapig, it produces pink coloured guineapig.If two such pink coloured guineapig are crossed, what is the expected offspring?
Solution
This is a classic example of incomplete dominance, where neither allele is completely dominant over the other, resulting in a blend of the two phenotypes.
Let's denote the red allele as "R" and the white allele as "W". The red guinea pig would have the genotype "RR" and the white guinea pig would have the genotype "WW". When these two are crossed, all the offspring will have the genotype "RW", which results in a pink phenotype due to the blending of red and white.
Now, if two pink guinea pigs (genotype "RW") are crossed, we can use a Punnett square to determine the possible genotypes of the offspring:
- The possible gametes for the parents are "R" and "W".
- Setting up a Punnett square, we have:
| R | W | |
|---|---|---|
| R | RR | RW |
| W | RW | WW |
So, the expected genotypes of the offspring would be:
- 25% RR (red)
- 50% RW (pink)
- 25% WW (white)
Therefore, if two pink guinea pigs are crossed, the expected phenotypes of the offspring would be 25% red, 50% pink, and 25% white.
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