Why men are 50% more likely to be colorblind than women.

Joking aside, why are men far more likely than women to be colorblind?

Men are more likely to be colorblind than women, why?  It is all about genes.  Our chromosomes come in pairs, we get one from each parent.  The female gamete has two X chromosomes, and the male gamete has an X and a Y chromosome.  For the child to be female, it must get an X chromosome from the mother, and an X chromosome from the father.  For the child to be male, they must get the X chromosome from the mother and the Y chromosome from the father.  The child will get an X from the female gamete regardless.

The genes for colorblindness are on the X chromosome.  If a female has something wrong with one of her X chromosomes, she has another to back it up, she would thus need two damaged X chromosomes to inherit colorblindness.  Males, however, only have one X chromosome, so if this chromosome is damaged, there is not another one to back it up.  Women have a chance of inheriting colorblindness, however, men are 50% more likely than women to inherit colorblindness.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s