A Level biology – Sex linkage
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Question 1 of 4
1. Question
A red-eyed male Drosophilia melanogaster and a white-eyed female are interbred. They produce 32 red-eyed female and 29 white-eyed male offspring. What is the best explanation for these results?
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Question 2 of 4
2. Question
The human X chromosome codes for around 900 polypeptides, and the Y chromosome codes for around 60 polypeptides. How many more genes are their on the X chromosome compared to a Y chromosome?
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Question 3 of 4
3. Question
Haemophilia is a sex-linked disorder. What would the phenotypes of parents be if the probability of their offspring having the disorder are: 0% if they are female; 50% if they are male?
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Question 4 of 4
4. Question
Two heterozygous yellow mice are cross-bred. Over 3 years they produce 48 yellow mice and 25 agouti (brown) mice. What is the most likely explanation for this observation?
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