The normal chromosome number in human cells is 46, comprising 22 autosomes and one pair of sex chromosomes.

The normal chromosome number in human cells is 46, comprising 22 autosomes and one pair of sex chromosomes.

• A. Trisomy
• B. Haploidy
• C. Polyploidy
• D. Disomy

Answer: (D)

Ploidy level defines how many copies of each chromosome are present in a cell. The normal state for human somatic cells is disomy, meaning two copies of every chromosome. This arrangement gives 46 chromosomes in total: 22 autosomes times two plus the sex chromosome pair. Trisomy would mean an extra copy of a chromosome, haploidy means only one copy per chromosome (as in gametes), and polyploidy means more than two complete sets of chromosomes. So disomy best matches the standard human somatic chromosome complement.

Ploidy level defines how many copies of each chromosome are present in a cell. The normal state for human somatic cells is disomy, meaning two copies of every chromosome. This arrangement gives 46 chromosomes in total: 22 autosomes times two plus the sex chromosome pair. Trisomy would mean an extra copy of a chromosome, haploidy means only one copy per chromosome (as in gametes), and polyploidy means more than two complete sets of chromosomes. So disomy best matches the standard human somatic chromosome complement.