Pair 23 in humans refers to which type of chromosome?

Pair 23 in humans refers to which type of chromosome?

• A. Sex chromosomes
• B. Autosomes
• C. Mitochondrial DNA
• D. Ribosomal DNA

Answer: (A)

Pair 23 refers to the sex chromosomes. In humans there are 46 chromosomes organized into 23 pairs: 22 autosomes and one pair of sex chromosomes. The 23rd pair determines biological sex, being XX in most females and XY in most males. The other options don’t fit because autosomes are the 22 other pairs, mitochondrial DNA is separate circular DNA inside mitochondria and not part of the nuclear chromosome set, and ribosomal DNA consists of rRNA gene sequences spread across chromosomes rather than forming a distinct chromosome pair.

Pair 23 refers to the sex chromosomes. In humans there are 46 chromosomes organized into 23 pairs: 22 autosomes and one pair of sex chromosomes. The 23rd pair determines biological sex, being XX in most females and XY in most males. The other options don’t fit because autosomes are the 22 other pairs, mitochondrial DNA is separate circular DNA inside mitochondria and not part of the nuclear chromosome set, and ribosomal DNA consists of rRNA gene sequences spread across chromosomes rather than forming a distinct chromosome pair.