Although the Most Frequent Forms of Down Syndrome Are Caused

question 39

Multiple Choice

Although the most frequent forms of Down syndrome are caused by a random error,nondisjunction of chromosome 21,Down syndrome occasionally runs in families.The cause of this form of familial Down syndrome is ____.

• A)a maternal age effect
• B)a chromosomal aberration involving chromosome 1
• C)an inversion involving chromosome 21
• D)a translocation between chromosome 21 and a member of the D chromosome group
• E)too many X chromosomes

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Definitions:

Sampling Distribution

The likelihood distribution of a metric derived from numerous samples collected from a certain group.

Sample Mean

The average of all the observations in a sample, used as an estimate of the population mean.

Central Limit Theorem

A statistical theory stating that, given a sufficiently large sample size from a population with a finite level of variance, the mean of all samples will be approximately equal to the mean of the population, with the samples approximating a normal distribution.

Statistical Inference

The process of drawing conclusions about population properties based on a sample taken from the population.