Wednesday, April 29, 2015

Y is for Y Chromosomes #atozchallenge

The Y chromosome was discovered by Nettie Stevens at Bryn Mawr in 1905.

Only males have the Y chromosome. In humans, the Y chromosome represents only 1% of the total DNA in a male's cells.The Y chromosome contains 200 genes. 

Male smokers have between 1.5 and 2 times the risks of developing lung cancer than do females.

Males are also susceptible to defects in the X chromosome since males have only one X chromosome.. 

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