The book starts at a rapid pace with the discovery ... the conflicting genetic explanations for homosexuality; Hox genes; the genetics of body odour; Tay-Sachs disease; α-integrins and learning ...

Nowhere is it clearly articulated what genetic services should be provided, although at several points in the book primary care genetics is implicitly or explicitly equated with genetic testing.

Dobzhansky thus bridged the gap between laboratory experiments and field observation, and his 1937 book Genetics and the Origin of Species was one of the cornerstones of the modern synthesis.