Duchenne muscular dystrophy is an x-linked recessive disease. X chromosomes carr

Question

Duchenne muscular dystrophy is an x-linked recessive disease. X chromosomes carrying the recessive allele are denoted XM. Sickle cell anemia is an autosomal disease earned on chromosome 11. Affected chromosomes are denoted CS. An asymptomatic female is heterozygous for both diseases. The normal chromosomes are denoted simply X and C. List the genotypes (with respect to these two loci) of an the possible gametes that she can produce List the genotypes if during first melotic division, nondisjunction occurs, affecting the X chromosomes of one of her oocytes

Explanation / Answer

FOUR GAMETES

XM CS


XM C


X CS

X C

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LEADS TO FORMATION MONOSOMIC, TROSOMIC AND NULLISOMIC GAMETS

   X XM XM ,    X X XM    ,           X   O,         XM O,    X X

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