Best answer: Do each of the 23 chromosomes has the same banding pattern?


Does each chromosome have a specific banding pattern?

Each chromosome has a unique sequence of bar code–like stripes, allowing identification of individual homologues and the analysis of abnormalities of their structure by disruption of the normal banding pattern.

Why is the 23rd chromosome different?

The 23rd pair of chromosomes are known as the sex chromosomes, because they decide if you will be born male or female. Females have two X chromosomes, while males have one X and one Y chromosome.

How many bands are in a chromosome?

In the complete set of 23 human chromosomes, there are approximately 850 G-dark bands visible at metaphase of mitosis. These bands have provided a useful way of subdividing the various regions of chromosomes, and each band has been assigned a specific number.

Why do chromosomes have different bands?

These bands were the same in appearance on the homologous chromosomes, thus, identification became easier and more accurate. The less condensed the chromosomes are, the more bands appear when G-banding. This means that the different chromosomes are more distinct in prophase than they are in metaphase.

What is the significance of the 23rd pair of chromosomes in humans?

The 23rd pair is made up of the sex chromosomes, called the ‘X’ and ‘Y’ chromosome. This is the pair of chromosomes that is responsible for ‘sex-linked’ medical conditions that pass through some families, such as the blood disorder haemophilia, which affects mainly males.

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Why must sperm cells and oocytes have only 23 chromosomes instead of 46 as most body cells do?

When the sperm and egg cells unite at conception, each contributes 23 chromosomes so the resulting embryo will have the usual 46. Meiosis also allows genetic variation through a process of gene shuffling while the cells are dividing.