Question

How many genes are present in a chromosome?

Answer 1

Gene:

1. A gene is defined as the basic physical and functional unit of heredity.
2. They are made up of DNA
3. Humans have about 20,000 to 23,000 genes.

Chromosome:

1. A chromosome is a DNA molecule that contains the genetic material of an organism.
2. Chromosomes are present in the nucleus of each cell.
3. Each chromosome is composed of DNA, packaged as thread-like structure and tightly coiled around special proteins called histones.

Number of genes on a chromosome:

1. All chromosomes have a varying number of genes.
2. In humans, chromosome 1 contains the maximum number of genes (2968)
3. Chromosome Y contains the least number of genes (231)
4. Chromosome 21 is the smallest chromosome and contains 300 genes.