Given below is a pedigree showing the inherit | vedclass

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(D) Myotonic Dystrophy is an autosomal dominant disorder. In a pedigree,a shaded symbol represents an affected individual,and an unshaded symbol repre

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$1-Mm, 2-Mm, 3-mm$

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(D) Myotonic Dystrophy is an autosomal dominant disorder. In a pedigree,a shaded symbol represents an affected individual,and an unshaded symbol represents an unaffected individual.For an autosomal dominant trait,the unaffected individuals must be homozygous recessive $(mm)$.Person $3$ is unaffected,so her genotype must be $mm$.Person $1$ is an affected male. Since he has an unaffected child,he must be heterozygous $(Mm)$.Person $2$ is an affected female. She has an unaffected child $(3)$,which means she must carry the recessive allele,so her genotype is $Mm$.Therefore,the genotypes are: $1-Mm, 2-Mm, 3-mm$.

Given below is a pedigree showing the inheritance of Myotonic Dystrophy,an autosomal dominant disorder. The genotypes of person $1, 2$ and $3$ in this family tree are:

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Choose the correct option for the pedigree analysis given below:

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