Telomeres double per chromosome in daughter nuclei during telophase

Steps:

• Diploid cell has 22 chromosomes total (2n=22), replicated to 44 chromatids during mitosis.
• In telophase, chromosomes separate to poles, forming two nuclei each with 22 chromosomes.
• Staining targets one nucleus, which contains 22 decondensed chromosomes.
• Each chromosome has two telomeres (one per end), so 22 × 2 = 44 telomeres observed.

Why B is correct:

• Linear eukaryotic chromosomes have two telomeres by definition, one at each terminus, yielding 44 for 22 chromosomes.

Why the others are wrong:

• A. Counts chromosomes instead of telomeres per chromosome.
• C. Overcounts by adding extra, possibly confusing with total chromatids or pairs.
• D. Doubles for both nuclei, but question specifies one nucleus.

Final answer: B