Multiple choice general knowledge foreign languages Each parent contributes 23------- to the start of human life. 23 genes 23 chromosomes 23 cells 23 sperms Reveal answer Fill a bubble to check yourself B Correct answer Explanation In human reproduction, each parent contributes exactly 23 chromosomes (through their sperm or egg) to form a complete set of 46 chromosomes in the fertilized embryo. This is a fundamental fact of human genetics. Humans have 23 pairs of chromosomes.