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.

Acknowledge the importance of emotional preparation and patient cooperation during examinations.

Understand the significance of prognosis following the assessment of a patient's condition.

Know the procedures and equipment necessary for specific examination methods.

Realize the procedure for safely assisting patients with mobility issues or disabilities during examinations.

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