In humans,each cell normally contains 23 pairs of,for a total of 46. Twenty-two of these pairs,called autosomes,look the same in both males and females. The 23rd pair,the ,differ between males and females. Females have two copies of the X ,while males have one X and one Y .
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How manydoes a human being have?
One set ofs comes from the mother, while the other comes from the father. The twenty third pair is called the chromosomes, while the rest of the 22 pairs are called autosomes. Typically, biologically male individuals have one X and one Y chromosome (XY) while those who are biologically female have two X chromosomes.
How are the Y chromosomes of all living men related?
The Y chromosome of all living men is related through a single male ancestor who lived over 100,000 years ago. In the nucleus of each cell, the DNA molecule is packaged into thread-like structures called chromosomes. Most human cells contain 23 pairs of chromosomes.
What is the difference betweenchromosomes and autosomes?
The twenty third pair is called the sex chromosomes, while the rest of the 22 pairs are called autosomes. Typically, biologically male individuals have one X and one Y chromosome (XY) while those who are biologically female have two X chromosomes. However, there are exceptions to this rule. The sex chromosomes determine the sex of offspring.
How common is variation in the number of sex chromosomes?
Variation in the number of sex chromosomes in a cell is quite common. Some men have more than two sex chromosomes in all of their cells (the XXY variation is called the Klinefelter syndrome), and many men lose the Y chromosome from their cells as they age. Smoking may exacerbate this loss.