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

Column $I$	Column $II$
$(1)$ Albinism	$(q)$ Recessive gene represented by $cc$
$(2)$ Phenylketonuria	$(s)$ Recessive gene represented by $pp$
$(3)$ Sickle cell anaemia	$(p)$ Recessive gene represented by $Hb^sHb^s$
$(4)$ Alkaptonuria	$(r)$ Recessive gene represented by $aa$

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:

Similar Questions

Both sickle cell anaemia and Huntington's chorea are

Match the columns:

Column $I$ Column $II$

$(1)$ Albinism $(q)$ Recessive gene represented by $cc$

$(2)$ Phenylketonuria $(s)$ Recessive gene represented by $pp$

$(3)$ Sickle cell anaemia $(p)$ Recessive gene represented by $Hb^sHb^s$

$(4)$ Alkaptonuria $(r)$ Recessive gene represented by $aa$

In Huntington's disease,the unaffected persons are homozygous for normal allele $h$. The following pedigree is erroneous because:

Which of the following is not a correct statement regarding Phenylketonuria?

Recessive characters are expressed:

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