Based on genomic analysis, the human genome is thought to include about 20,000 protein-coding genes. Therefore, option B: '20,000' is the correct answer.
A human genome is an entire set of DNA (genetic material) instructions found in an organism. The genome contains genes and other elements that control the activities of those genes. According to the research, about 20,000 protein-coding genes are there in the human genome; while the rest of the genes in the human genome are noncoding, meaning that they do not provide instructions for producing proteins.
Thus, according to the genomic analysis, the human genome includes approximately 20,000 protein-coding genes.
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