Human genetics — karyotype: A normal adult human male has which of the following chromosomal constitutions? Context: Total chromosome number and sex chromosomes. Choose the correct option.

Difficulty: Easy

46 chromosomes: 44 autosomes + XY
46 chromosomes: 44 autosomes + XX
48 chromosomes: 46 autosomes + XY
23 chromosomes: 22 autosomes + Y

Correct Answer: 46 chromosomes: 44 autosomes + XY

Explanation:

Concept
Humans are diploid with 2n = 46 chromosomes. A typical male has 44 autosomes + XY sex chromosomes; a typical female has 44 autosomes + XX.

Elimination
Options with XX or incorrect totals (48, 23) are wrong.

Final Answer
46 (44 autosomes + XY).

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