The nurse is preparing a presentation about chromosome abnormalities and is focusing on nondisjunction—an addition or deletion of a chromosome occurring after fertilization, which may result in the embryo having two or more chromosomes that evolve into more than one cell line. Which term describes this phenomenon?

A) Mosaicism
B) Monosomy
C) Trisomy 21
D) Trisomy 13

The condition, in which an addition or deletion of chromosome occurs after fertilization, leading to two or more chromosomes that evolve into more than one cell line, is known as Mosaicism. Option A is correct.

Explanation:

The term that describes the condition where an addition or deletion of chromosome occurs after fertilization, resulting in the embryo having two or more chromosomes that evolve into more than one cell line, is Mosaicism. Nondisjunction is a process in which there is a failure of sister chromatids or homologous chromosomes to separate during meiosis, leading to an abnormal number of chromosomes in offspring.

This can result in conditions like trisomy 21 (Down Syndrome), which is caused by an extra copy of chromosome 21 due to nondisjunction. However, when this occurs in only a select few of the body's cells, rather than all, it leads to mosaicism. This means that an individual can display symptoms of a disorder in some parts of their body, while other parts are unaffected - a characteristic feature of mosaicism.

Option A

Learn more about Mosaicism here:

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