how many dna base pairs does each human haploid cell contain

Each human haploid cell contains about 3.3 billion (3.3 × 10⁹) DNA base pairs.

Key fact

• The human haploid genome (the DNA content of a gamete such as a sperm or egg) is roughly 3.0–3.3 × 10⁹ base pairs spread across 23 chromosomes.

• A diploid human somatic cell therefore has about 6.0–6.6 × 10⁹ base pairs (two haploid sets, 46 chromosomes total).

Mini explanation

• “Haploid” means one complete set of chromosomes; in humans, that is 23 chromosomes carrying about 3.3 billion base pairs of DNA.

• When egg and sperm fuse at fertilization, their haploid genomes combine to form a diploid zygote with roughly double that DNA content.

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