suppose that you have a pet cat named ronald that is from a pure-breeding clawle
ID: 13519 • Letter: S
Question
suppose that you have a pet cat named ronald that is from a pure-breeding clawless strain. Clawlessness is recessive to having claws. your friend had brought her cat, delilah, over to visit. Delilah is from a separate pure-breeding clawless line. Your friend called six weeks later to tell you that Delilah has given birth to kittens with claws.a. explain what has happened. Assign genotypes to all ferrets involved and provide a diagram.
b. testcrosses of several of the kittens were done. out of a totale of 90 granchildren of ronald and delilah, 20 had claws and 70 were clawless. Assign genotypes to all the cats involed. explain what these numbers imply,.
Explanation / Answer
C = claws c = clawless Problem states that clawless is recessive, so we can assume claws are dominant. Ronald's genotype: cc Delilah's genotype: CC We can assume that Delilah is homogenous dominant because the problem does not say that some of the offspring had claws and some do not (in this case, her genotype would be Cc). .......c...x...c ...C..Cc....Cc ...x............ ...C..Cc....Cc a) using the punnet square above, we see that the cross cc with CC results in all offspring becoming Cc, heterozygous. Because claws are dominant, all offspring have claws. b) the cross in this situation would be Cc x Cc, which would yield the genotypes CC, Cc and cc in a ratio of 1:2:1 respectively. The ratio given in the problem is roughly 3:1 in favor of the recessive gene, so something else is happening here. In a 3:1 ratio of a recessive gene, there is a very strong possibility of sex linkage.
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