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In cats, coat color is an X-linked trait with incomplete dominance. Yellow coat is caused by the allele XT and black coat by the allele Xt. A tortoise cost is caused by the heterozygous condition. What is the correct way to represent the genotype of a male cat with a black coat

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marianaegarciaperedo

Answer:

The genotype of a black male is XtY

Explanation:

Available data:

  • coat color is an X-linked trait with incomplete dominance.
  • Yellow coat is caused by the allele XT
  • Black coat by the allele Xt.
  • Tortoise coat is caused by the heterozygous condition

So,

females genotypes           females phenotype

  •   XTXT                →        Yellow coat
  •   XtXt                  →         Black coat
  •   XTXt                 →         Tortoise coat

males genotype                    males phenotype

  •   XTY                   →         Yellow coat
  •   XtY                    →         Black coat

Males only carry one X chromosome, so they can only be either black - XtY- or yellow -XTY-.

Females are the only ones that can express the tortoise coat.

Histrionicus

The correct way to represent the genotype of a male cat with a black coat - XtY

We know that,

  • In cats, coat color is an X-linked trait - it means it is influenced by the X allele only
  • In cats, coat color is shows incomplete dominance - it means if corresponding alleles present together they will show an intermediate coat color.
  • the allele XT - Yellow coat
  • the allele Xt - black coat
  • XTXt (heterozygous) - tortoise coat (incomplete dominance)
  • In X linked traits heterozygous conditions are not possible in males as they have only one X allele and the other is Y allele.

So,

Female cats genotype would be:

  1. XTXT - female cat with yellow coat
  2. XTXt - female cat with a black coat
  3. XtXt - female cat with tortoise coat

Male cats genotype:

1. XtY - black coat male cat

2. XTY - yellow coat male cat.

Thus, The correct way to represent the genotype of a male cat with a black coat - XtY

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