Question

how many genes make up the human genome?
four: adenine, thymine, guanine, and cytosine
23 pairs of genes
20,000 - 25,000 genes
3 billion genes

Explanation:

• Adenine, thymine, guanine, and cytosine are nucleotides, not genes.
• Humans have 23 pairs of chromosomes, not genes.
• 3 billion refers to the number of base pairs in the human genome, not genes.
• The current estimate is that the human genome contains 20,000 - 25,000 protein - coding genes.

Answer:

20,000–25,000 genes