In cats, black fur color is caused by an X-linked allele; the other allele at this locus causes orange color. The heterozygote is tortoiseshell. What kinds of offspring would you expect from the cross ofan orange female and a black male?A) black females; orange malesB) tortoiseshell females; black malesC) tortoiseshell females; tortoiseshell malesD) tortoiseshell females; orange malesE) orange females; black males

Question
Asked Dec 8, 2019
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In cats, black fur color is caused by an X-linked allele; the other allele at this locus causes orange color. The heterozygote is tortoiseshell. What kinds of offspring would you expect from the cross of
an orange female and a black male?

A) black females; orange males
B) tortoiseshell females; black males
C) tortoiseshell females; tortoiseshell males

D) tortoiseshell females; orange males

E) orange females; black males

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Expert Answer

Step 1

Inheritance pattern in organisms follow mostly Mendelian principles. The three Mendelian principles are Law of Dominance, Law of Segregation and Law of Independent Assortment.

Law of Dominance states that out of a pair of contrasting characters only one can express itself and the other remans suppressed.

Law of Segregation: The two members out of a pair of factors separate during the formation of gametes.

Law of Independent Assortment: In case of two pairs of characters, the distribution of alleles in one character into the gametes is independent of the distribution of the allele of the other character of the gametes.

Step 2

There are two types of inheritance- Autosomal inheritance and Sex-linked inheritance.

Autosomal inheritance is the inheritance of genes present on autosomes. For example, Phenylketonuria is an example of autosomal recessive inheritance pattern.

Sex-linked inheritance is the inheritance of genes present on sex chromosomes. For example, Hemophilia is a sex-linked recessive trait.

Step 3

Given that black fur color is caused by an X-linked allele. Also, heterozygote condition is tortoiseshell.

From the information given in the question, we can deduce that

XBY = Orange male

XbY ...

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