Which of the Following Statements Is TRUE Regarding Nondisjunction

question 102

Multiple Choice

Which of the following statements is TRUE regarding nondisjunction?

• A)Nondisjunction only occurs during meiosis I or meiosis II  never during mitosis.
• B)Nondisjunction occurring during meiosis II results in two gametes that completely lack certain chromosomes.
• C)Nondisjunction only contributes to the development of trisomy 21  not trisomy 13 or 18.
• D)Nondisjunction only occurs between autosomes  the sex chromosomes are rarely affected by nondisjunction.
• E)None of the answer options is correct.

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Definitions:

Chromosomes

Structures found within cells that contain genetic information (DNA) passed from one generation to the next.

Genes

Units of heredity made up of DNA that carry instructions for producing proteins that determine the characteristics of an organism.

Chromosomes

Thread-like structures located inside the nucleus of animal and plant cells, made of protein and a single molecule of deoxyribonucleic acid (DNA), carrying genetic information in the form of genes.

DNA Molecules

The carriers of genetic information in living organisms, consisting of two long strands forming a double helix.