(B) In the given pedigree chart,the disorder is autosomal recessive. Individuals in generation $II$ are affected (shaded),meaning they must have the g

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(B) In the given pedigree chart,the disorder is autosomal recessive. Individuals in generation $II$ are affected (shaded),meaning they must have the genotype $aa$. Since the parents in generation $I$ are unaffected but have affected children in generation $II$,both parents must be carriers of the recessive allele. Therefore,the genotype of the parents in generation $I$ must be $Aa$ and $Aa$.

Class 12 Biology Principles of Inheritance and Variation Pedigree Analysis and Mendelian disorders

Medium

Identify the genotype of the first generation $(I)$ for an autosomal recessive disorder based on the provided pedigree chart.

A
$aa, aa$
B
$Aa, Aa$
C
$AA, AA$
D
$aa, AA$

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Chapter

Principles of Inheritance and Variation

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Pedigree Analysis and Mendelian disorders

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Identify the genotype of the first generation $(I)$ for an autosomal recessive disorder based on the provided pedigree chart.

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$A$ colorblind man marries a normal woman whose father was colorblind. Among their two sons and two daughters,who will be colorblind?

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