Your professor has two cats, as shown in the image above. The male has an orange fur coat while the female has a mixture of black patches of fur and orange patches of fur. Which of the following explains this difference? Select ALL answer choices that apply.

Question

BlackTom AI · Accepted Answer

Question restatement: The scenario describes two cats, a male orange cat and a female calico cat (orange and black patches). We need to select all explanations that apply.

Option 1: The color of the fur is determined by a gene on the X chromosome.
This is correct. In cats (and many other mammals), the gene for orange vs black fur is located on the X chromosome. Because males have one X chromosome (XY), their fur color is determined by the single X they carry. If that X carries the orange allele, the male is orange; if it carries the black allele, the male would be black (assuming no other masking alleles). This explanation aligns with the inheritance pattern observed in the image where sex chromosomes influence fur color.

Option 2: Females can be heterozygotes for fur color since they have two X chromosomes. Random inactivation of an X chromosome ("Barr body") in a cell can result in either the orange fur color or the black fur color.
This is also correct. Female mammals have two X chromosomes, so they can be heterozygous for the fur-color gene. Due to X-chromosome inactivation (Lyonization), in each cell one X is randomly silenced, producing a mosaic of cells expressing either the orange or black allele. This cellular mosaic leads to calico or tortoiseshell patterns in females when the two X-linked alleles are different, as seen in the calico female cat.

Why the other potential interpretations are not listed (and why these two are sufficient): There is no need to invoke autosomal genes or dominant/recessive patterns beyond the X-linked nature for this trait, since the classic calico pattern in female cats is a result of X-linked inactivation. The statements provided capture both the X-linked basis and the consequence of random X inactivation that creates mosaic fur color in females.

Your professor has two cats, as shown in the image above. The male has an orange fur coat while the female has a mixture of black patches of fur and orange patches of fur. Which of the following explains this difference? Select ALL answer choices that apply.多项选择题

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