I'm sure he brings up homosexuality because there has been discussion in scientific communities of finding a genetic test for homosexuality. I'm sure there are families out there that would have a hard time wrestling with their anti-abortion views would they find out their fetus was positive for a hypothetical homosexuality gene.
There was a recent study by the way demonstrating abnormalities in fetal brain development in patients with autism that were donated to science after death. The brains were compared to normal specimen, and researchers noted a jumbled appearance of the normal layers of the cortex in varying areas of the brain. This would explain the variable symptoms and severity in the spectrum.
http://www.npr.org/blogs/health/2014...ntent=03032014
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