The approximate number of genes contained in the human genome is –
**Core Concept**
The human genome is composed of approximately 3 billion base pairs of DNA, which encode the genetic information necessary for the development, function, and regulation of the human body. The human genome project has provided a comprehensive understanding of the genetic blueprint of humans, revealing the number of genes that make up the human genome.
**Why the Correct Answer is Right**
The human genome contains approximately 20,000-25,000 protein-coding genes, which account for about 1.5% of the total DNA content. The remaining 98.5% of the genome consists of non-coding regions, including introns, intergenic regions, and regulatory elements that play crucial roles in gene expression and regulation. The Human Genome Project (HGP) was a collaborative effort that mapped the entire human genome, providing a detailed understanding of the genetic code and its organization.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is likely incorrect as it is lower than the widely accepted estimate of 20,000-25,000 protein-coding genes.
* **Option B:** This option is also incorrect as it is higher than the estimated number of protein-coding genes.
* **Option D:** This option is not provided, so it cannot be evaluated. However, it is likely incorrect as it does not match the widely accepted estimate.
**Clinical Pearl / High-Yield Fact**
It is essential to remember that the human genome is highly polymorphic, with each individual having a unique genetic makeup. This genetic diversity is a critical aspect of human biology, influencing susceptibility to disease, response to treatment, and overall health outcomes.
**Correct Answer: C. 20,000-25,000**