Discusses the hereditary factors which determine physical appearance and sex, the environmental factors which affect attitudes and behavior, the influence of dominant and recessive genes, and the difference between identical and fraternal twins.
(the hereditary factors; determine; physical appearance and sex) (the environmental factors; affect; attitudes and behavior, the influence of dominant and recessive genes, and the difference between identical and fraternal twins)
the hereditary factors the environmental factors
determine affect
physical appearance and sex
attitudes and behavior, the influence of dominant and recessive genes, and the difference between identical and fraternal twins