*. (4 pts) Rabbits can have either Himalayan or gray coats. A series of crosses
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Question
*. (4 pts) Rabbits can have either Himalayan or gray coats. A series of crosses were made, and the following ratios were observed: Cross 1: gray x gray = All gray Cross 2: Himalayan x gray All Himalayan Cross 3: Himalayan x gray Himalayan:1 gray Cross 4: Himalayan x Himalayan- All Himalayan. Cross 5: Himalayan x Himalayan 3 Himalayan:1 gray A. Which phenotype is dominant? Create your own gene symbol and give the genotypes of the parents (as close as you can determine) EACH cross (i.e. you will have determined the parental genotypes for crosses 1-5). B.Explanation / Answer
Answer:
4. (A) Cross 2 shows that Himalayan x gray = All Himalayan.
So, Himalayan is the dominant phenotype since we know that the dominant allele gets expressed.
(B) Let the dominant allele (Himalayan) be H and recessive (Gray) be h.
Genotype of the parents in the individual crosses have been given below:
Cross 1: Gray (hh) x gray (hh) = All Gray (hh)
Cross 2: Himalayan (HH) x Gray (hh) = All Himalayan (Hh)
Cross 3: Himalayan (Hh) x Gray (hh) = 1 Himalayan (Hh) : 1 Gray (hh)
Cross 4: Himalayan (HH) x Himalayan (H_) = All Himalayan (H_)
Cross 5: Himalayan (Hh) x Himalayan (Hh) = 3 Himalayan (H_) : 1 Gray (hh)
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