3. Audra is a carrier for the autosomal recessive disease cystic fibrosis (Tt) a

Question

3. Audra is a carrier for the autosomal recessive disease cystic fibrosis (Tt) and is also a carrier for the X-linked disease hemophilia (X ). Audra produces an egg that has the T allele and the H and h alleles of the muscular dystrophy gene. Assuming no crossing over, what can you conclude? A. The gamete has a normal chromosomal number. B. A nondisjunction event occurred in Meiosis L. C. A nondisjunction event occurred in Meiosis II. D. A nondisjunction event occurred, but you can't determine when it occurred during meiosis.

Explanation / Answer

Is the right answer. Because non disjunction is a random event. If it occurred in somatic cell results in down syndrome (trisomy 21) if it occurs in sex chromosome results in klinefelture syndrome (XXY). But non disjunction do not have any relation with genetic aberrations.

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