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  • Study the pedigree chart given below: What does it show ?<d

Study the pedigree chart given below:

What does it show ?

Option: 1

Inheritance of a condition like phenylketonuria as an autosomal recessive trait


Option: 2

The pedigree chart is wrong as this is not possible


Option: 3

Inheritance of a recessive sex-linked disease like haemophilia


Option: 4

Inheritance of a sex-linked inborn error of metabolism like phenylketonuria


Answers (1)

best_answer

According to the family tree, offspring from normal parents exhibit the trait, i.e. the trait is recessive in normal parents; the trait is recessive.In the first line of filial piety, sons and daughters present this characteristic.As we know, sex-linked recessive traits can be expressed in both sexes, but not simultaneously; X-linked traits are expressed in male offspring while female offspring act as carriers, and Y-linked traits are only expressed in boys. The trait was present in both sons and daughters of the F 1 generation, confirming that it is an autosomal trait.

The second generation parent must have a carrier parent and a homozygous recessive parent to pass it on to 1/3 of the offspring. Hence option 1 is correct.

Posted by

Gunjita

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