Questions: 18 Multiple Choice 2 points Which of the following is a condition in which a person inherits an extra copy of a chromosome? duplication inversion monosomy disjunction trisomy

The answer is the last one (E): trisomy.

Explanation for each option:

• Duplication: This refers to a segment of a chromosome being duplicated, resulting in extra genetic material, but it does not involve an entire extra chromosome. Therefore, it is incorrect.

• Inversion: This is a condition where a segment of a chromosome is reversed end to end. It does not involve an extra chromosome, so it is incorrect.

• Monosomy: This is a condition where a person is missing one chromosome from a pair. It is the opposite of having an extra chromosome, so it is incorrect.

• Disjunction: This term refers to the normal separation of chromosomes during cell division. It does not describe a condition of having an extra chromosome, so it is incorrect.

• Trisomy: This is a genetic condition where a person has three copies of a chromosome instead of the usual two. This is the correct answer as it directly describes the inheritance of an extra chromosome.

In summary, trisomy is the condition in which a person inherits an extra copy of a chromosome.