2. A black female cat is mated with an orange male cat. They produce two tortois
ID: 150609 • Letter: 2
Question
2. A black female cat is mated with an orange male cat. They produce two tortoiseshell females, two black males, one orange female, and one tortoiseshell male, for a total of six kittens. Orange and black fur color are encoded by different alleles of the same X-linked fur color gene. Based on the phenotypes of the parents, what sex chromosomes do the orange female and the tortie male offspring have The orange female has multiple X chromosomes, and the tortoiseshell male is missing a Y chromosome. O o The orange enale has only one X chromosome, and the tortoiseshell male is XXY. The orange female is missing one X chromosome, and the tortoiseshell male is XY O O The orange female is XX, and the tortoiseshell male is XXY. Select the most likely explanations for the sex chromosome types. Both of the orange female's X chromosomes carry the orange allele. The orange female has only one Xchromosome, and it came from her father. The male tortoiseshell received a black X chromosome from his mother and no color genes from his father. The male tortoiseshell received a black X chromosome from his mother and an orange X from his fatherExplanation / Answer
For question 1, the orange female is XX and the tortoiseshell male is XXY.
Explanation: the orange female's both the X chromosome carries the orange allele.
the male tortoiseshell cat received a black X chromomosome from his mother and a orange X chromosome from his father.
Since, one of the X chromosome did not undergo inactivation, so, both the X chromosome expressed.
For question 2,
option 3 is the suitable answer.
the child is having Xa which is the dominant allele, which will express. A non-disjunction at meiosis I will lead to production of sperms with Xa Y. When these sperms fuse with a X-X- female , the child born will have Xa X- Y genotype.
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