PSY210H5 Chapter Notes - Chapter 2&3: Classical Conditioning, Operant Conditioning, Little Albert Experiment
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: the cause of pku is a recessive allele that fails to produce an enzyme necessary to metabolize the protein phenylalanine in milk. As long as a person also processes a normal allele,the pku allele has no ill e ects(this person is just a carrier of the recessive allele). The problems start only in infants who are homozygous for the recessive allele: some harmful alleles may survive b/c they are actually bene cial in combination with a norma allele, ex. The more e ectively parents and others agents of socialization accept and adapt to the child"s unique temperament,the better this t . 1)a teratogen exerts its e ects largely during critical periods. The organism is most vulnerable during the embryonic stage, however, each organ system has a di erent critical period. 3)either maternal or fetal genotypes may counteract a teratogen"s e ects. Infants who develop defects do so b/c of their own genetic vulnerability.
