Health The Y chromosome is disappearing. Here’s what it means for men

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In the span of the last 166 million years, the male sex chromosome has shed the majority of its 1,600 genes

Sex determination at birth is decided on the chromosomes the baby has. A female has two X chromosomes, whereas a male has one X and one Y chromosome.

According to Medline Plus, in every cell, humans possess 23 pairs of chromosomes, among which the sex chromosomes constitute one pair. The X chromosome, comprising roughly 155 million DNA base pairs, makes up around 5% of the total DNA in cells.

The Y chromosome extends over more than 59 million DNA building blocks (base pairs) and accounts for nearly 2% of the total DNA found in cells.

However, according to The Conversation, the Y chromosome is degrading at a concerning rate.

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