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

---

Definitions:

Data Bus

A communication system within a computer or between computers designed to transfer data or instructions between components.

Physical Power Line

Electrical lines or cables that transmit electrical power from one location to another.

PLC Communication

The process of exchanging data between Programmable Logic Controllers (PLCs) and other devices or systems for control and monitoring purposes.

Carrier

A component in differential systems designed to hold the gears in place and distribute torque to the wheels.