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◉ Science·1 min·Updated Mar 11, 2026

What is Chromosome?

Chromosome

Quick Answer

A chromosome is a long, thread-like structure made of DNA and proteins that carries genetic information. They are found in the cells of living organisms and play a crucial role in heredity and cell division.

Overview

Chromosomes are essential components of cells, containing the genetic blueprint that determines the traits of living organisms. Each chromosome is made up of DNA, which is tightly coiled and packaged with proteins, allowing it to fit within the cell nucleus. In humans, for example, there are 23 pairs of chromosomes, with one set inherited from each parent, which contributes to our unique genetic makeup. During cell division, chromosomes ensure that DNA is accurately copied and distributed to daughter cells. This process is vital for growth, development, and repair of tissues. If chromosomes do not function correctly, it can lead to genetic disorders or diseases such as cancer, highlighting their importance in maintaining healthy biological processes. Understanding chromosomes also helps scientists in fields like genetics and medicine. For instance, genetic testing can reveal information about inherited diseases by examining specific chromosomes for mutations. This knowledge can guide treatment options and inform individuals about potential health risks, demonstrating the significance of chromosomes in our lives.

Frequently Asked Questions

A chromosome consists of tightly coiled DNA wrapped around proteins called histones. This structure helps to organize the DNA and make it manageable within the cell nucleus.
Humans typically have 46 chromosomes, arranged in 23 pairs. Each pair consists of one chromosome inherited from each parent, containing genes that influence various traits.
Problems with chromosomes can lead to genetic disorders, such as Down syndrome, which is caused by an extra copy of chromosome 21. Other issues, like missing or damaged chromosomes, can lead to serious health conditions, including cancer.