A Mutation Results in a Cell That No Longer Produces

question 66

Multiple Choice

A mutation results in a cell that no longer produces a normal protein kinase for the M-phase checkpoint. Which of the following would likely be the immediate result of this mutation?

• A) The cell would prematurely enter anaphase.
• B) The cell would never leave metaphase.
• C) The cell would never enter metaphase.
• D) The cell would never enter prophase.
• E) The cell would undergo normal mitosis, but fail to enter the next G₁.

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Definitions:

BRCA1 Gene

A gene that produces a protein responsible for repairing DNA, where mutations can lead to an increased risk of breast and ovarian cancer.

Chromosome

A long, continuous thread of DNA that contains numerous genes and regulatory information, present in the nucleus of most living cells.

BRCA1 Gene

A gene that produces a protein playing a key role in repairing damaged DNA; mutations in BRCA1 can significantly increase the risk of breast and ovarian cancer.

Variant

An individual or group that exhibits differences in physical traits, behavior, or genetic composition from the typical or expected form.