This pedigree is of a rare trait, in which children have extra fingers and toes. Which one of the following patterns of inheritance is consistent with this pedigree?

Autosomal recessive

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Autosomal dominant

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Y linkage

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Sex linked recessive

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Solution

The correct option is C Y linkage
Males inherit a Y chromosome from their father. From the pedigree chart, the males are the only ones who are affected and it is the clear evidence of Y-linked disease.
So, the correct answer is 'Y linkage'

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Figure

(i) Who is colour blind in the parents - Father or Mother?
(ii) How many daughters and sons have been born in the family?
(iii) What does the child 1 indicate about this trait?
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Q. From the pedigree chart given below, identify if the trait is sex linked dominant or recessive.

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This pedigree is of a rare trait, in which children have extra fingers and toes. Which one of the following patterns of inheritance is consistent with this pedigree?

The correct option is C Y linkageMales inherit a Y chromosome from their father. From the pedigree chart, the males are the only ones who are affected and it is the clear evidence of Y-linked disease.So, the correct answer is 'Y linkage'

The correct option is C Y linkage
Males inherit a Y chromosome from their father. From the pedigree chart, the males are the only ones who are affected and it is the clear evidence of Y-linked disease.
So, the correct answer is 'Y linkage'