The Weaker Sex?

The answer may be 'male' if you take into account the ages at which the sexes have children.  More attention is being paid to older fathers and it looks like they are a lot more likely to father children with disabilities than a younger father with around 40 being the dividing age.

Here are some of the things that happen with older fathers:

• a man over 40 is almost six times as likely as a man under 30 to father an autistic child. 
• the likelihood of offspring with schizophrenia doubles when the father hits 40 and triple at age 50. 
• the incidence of bipolarity, epilepsy, prostate cancer, breast cancer and dwarfism also increases in children born to men approaching 40.
• some intelligence tests show lower results for the children of older fathers.

It seems that the difference between male and female reproductive systems results in the male system having more opportunities to create DNA. Sometimes this DNA is not created just right.