Mr and Mrs

question 33

Multiple Choice

Mr. and Mrs. Smith have three sons in elementary school. Two of their children are progressing normally, but their youngest son, Charles, has been much slower than his siblings in developing speech and language skills. His parents are concerned that he has a learning disability and decide to investigate further. Since some learning disabilities can be genetically based, their pediatrician recommends a chromosomal analysis.
The results show that Charles has a trisomy of the sex chromosomes, diagnosed as XYY. A mistake during sperm formation resulted in an extra copy of the Y chromosome. The extra copy was passed on to Charles during fertilization. Most often, this chromosomal change causes no unusual physical features or medical problems, but those with trisomy of the sex chromosomes may have a higher-than-normal risk of delays in learning development.
-During which stage of meiosis could this mistake have occurred?

• A) telophase I
• B) prophase I
• C) anaphase II
• D) telophase II

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Definitions:

Working Memory

A mental system designed to hold information temporarily for the purpose of processing, essential in guiding both reasoning and decision-making actions.

Long-Term Memory

The phase of memory responsible for the storage and retrieval of information over a long period.

Sensory Memory

The shortest-term element of memory, which allows retention of impressions from sensory information after the original stimuli have ended.

Short-Term Memory

A type of memory that holds a small amount of information in an active, readily available state for a short period of time.