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QUESTIONS |
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| 1. |
Fur colour in the Canadian Bigfoot is controlled by three alleles Cb, Cr,
and c. (c is recessive)
A black-coated male mated with a red-coated female over a number of years, producing a family of ten offspring; 2 black, 3 red, 2 chestnut (a mixture of black and red hairs), and 3 white. |
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| (a) | What term would you use to describe the alleles Cb and Cr ? | ||
| (1) | |||
| (b) |
What is the genotype of the white-coated offspring? |
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| (1) | |||
| (c) | What are the genotypes of the two parents? | ||
| and | (1) | ||
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(d) |
What ratio would you have predicted for the four phenotypes listed above, and why does this family not show precisely that? | ||
| (2) | |||
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(e) |
If two chestnut coated bigfoot mated, what would the probability be of their first baby also being Chestnut coated? | ||
| (1) | |||
| Neil Edwards, Hutton Grammar School, Preston | |||