Question

which of the following is an example of a mutation?
a
a nucleotide is missing in a replicated dna strand
b
a strand of dna is used to create specific proteins
c
a zygote receives two x chromosomes
d
a red blood cell loses its nucleus

Explanation:

To determine the mutation example, we analyze each option:

• Option A: A nucleotide missing in a replicated DNA strand is a mutation (change in DNA sequence).
• Option B: Using a DNA strand for patterns is not a mutation (related to processes like replication/transcription, not sequence change).
• Option C: A zygote receiving two X chromosomes is a normal genetic scenario (e.g., female development), not a mutation.
• Option D: A red blood cell losing its nucleus is a normal cellular differentiation process, not a DNA - sequence - based mutation.

Answer:

A. A nucleotide is missing in a replicated DNA strand