Some mutations result in proteins that function well at one temperature but are nonfunctional at a different (usually higher) temperature. Siamese cats have such a "temperature-sensitive" mutation in a gene encoding an enzyme that makes dark pigment in the fur. The mutation results in the breed's distinctive point markings and lighter body color (see the photo). Using this information and what you learned in the chapter, explain the pattern of the cat's fur pigmentation.
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Some mutations result in proteins that function well at one temperature but are nonfunctional at a different (usually higher) temperature. Slamese cats have such a "temperature-sensitive" mutation in a gene encoding an enzyme that makes dark pigment in the fur. The mutation results in the breed's distinctive point markings and lighter body color (see the photo). Using this information and what you learned in the chapter, explain the pattern of the cat's fur pigmentation.
Sri K.
In Siamese cats, the fur on the ears, paws, tail, and face is usually black or brown, while the rest of the body fur is almost white. If a Siamese cat is kept indoors where it is warm, it may grow fur that is almost white on the ears, paws, tail, and face, while a Siamese cat that stays outside where it is cold will grow fur that is quite dark on these areas. The best explanation for these changes in fur color is that: A. An environmental factor influences the expression of this inherited trait. B. The location of pigment-producing cells determines the DNA code of the genes. C. Skin cells that produce pigments have a higher mutation rate than other cells. D. The gene for fur color is modified by interactions with the environment.
Jakob W.
Coat color in cats is determined by genes at several different loci. At one locus on the X chromosome, one allele $\left(X^{+}\right)$ encodes black fur; another allele (X") encodes orange fur. Females can be black $\left(\mathrm{X}^{+} \mathrm{X}^{+}\right)$, orange $\left(\mathrm{X}^{\circ} \mathrm{X}^{\circ}\right),$ or a mixture of orange and black called tortoiseshell $\left(\mathrm{X}^{+} \mathrm{X}^{\circ}\right)$ Males are either black $\left(X^{+} Y\right)$ or orange $\left(X^{\circ} Y\right) .$ Bill has a female tortoiseshell cat named Patches. One night Patches escapes from Bill's house, spends the night out, and mates with a stray male. Patches later gives birth to the following kittens: one orange male, one black male, two tortoiseshell females, and one orange female. Give the genotypes of Patches, her kittens, and the stray male with which Patches mated.
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