Why Is Down Syndrome the Most Common Trisomy Disorder Seen

question 9

Multiple Choice

Why is Down syndrome the most common trisomy disorder seen among liveborn infants?

• A)The extra alleles from trisomies of larger chromosomes are embryo lethal.
• B)Nondisjunction occurs more frequently for chromosome 21 than for any other chromosome.
• C)Trisomies resulting from nondisjunction express fewer alleles than trisomies that result from unbalanced translocations.
• D)The incidence may not be truly higher but is recognized more often because the features of a baby with trisomy 21 are more obvious and not missed as often as are the more subtle features of other trisomies.

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