The human chromosome with the highest and least number of gens in them are respectively

Options

A. chromosome 21 and Y
B. chromosome 1 and X
C. chromosome 1 and Y
D. chromosome X and Y

Explanation

To answer the question regarding which human chromosome has the highest and least number of genes, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Human Chromosomes**: Humans have a total of 23 pairs of chromosomes, which include 22 pairs of autosomes and 1 pair of sex chromosomes (XX in females and XY in males).

2. **Identify Chromosome with Highest Genes**: Among all the chromosomes, Chromosome 1 is known to have the highest number of genes. Research indicates that Chromosome 1 contains approximately 2,968 genes.

3. **Identify Chromosome with Least Genes**: In contrast, the Y chromosome, which is one of the sex chromosomes found in males, has the fewest genes. The Y chromosome is estimated to contain around 231 genes.

4. **Conclusion**: Therefore, the human chromosome with the highest number of genes is Chromosome 1, and the chromosome with the least number of genes is the Y chromosome.

### Final Answer:
The human chromosome with the highest number of genes is Chromosome 1, and the chromosome with the least number of genes is the Y chromosome.

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