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Suppose that only two genes control height in humans, and that the environment has no effect....

Suppose that only two genes control height in humans, and that the environment has no effect. One gene has alleles A and a, where A is incompletely dominant with a. The other gene has alleles B and b, where B is incompletely dominant with b. Individuals with genotype A A B B have the tallest height. A contributes the same amount to height as B does. a contributes the same amount to height as b does. For example, individuals with genotype A A b b or A a B b have the same height.
a) How many different categories of height would occur? Explain. [6 marks]
b) How would the distribution of height in the population be different if the enviroment did have an effect? [2 marks]
c) How many categories of height would occur if allele a was a recessive lethal allele? Explain. [3 marks]

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