The consequences of a recessive metabolic disorder such as PKU can be counteracted with a modification in dietary intake, making PKU a good example of
a. the benefits of having a dominant masking gene.
b. the benefits of having an unexpressed recessive gene.
c. how the phenotype and environment interact to affect the genotype.
d. how the genotype and environment interact to affect the phenotype.
Question 2Catherine has given birth to a premature infant boy. Current research that has examined the interactions between mothers and their premature infants suggests that
a. Catherine's premature baby will probably be more responsive to Catherine's behaviors than full-term babies will be to their mothers' behavior.
b. Catherine will probably touch, hold, and smile at her newborn baby less often than do mothers of full-term infants.
c. Catherine will probably touch, hold, and smile at her newborn baby more often than do mothers of full-term infants.
d. the interaction between Catherine and her premature baby will probably be no different from the interaction between full-term babies and their mothers.
Question 3Joanna, a child born with the genetic condition PKU, may suffer mental retardation unless
a. the child undergoes gene therapy.
b. the child is given drug therapy.
c. the child's diet is restricted to eliminate phenylalanine.
d. the child's diet is restricted to eliminate ribonucleic acid.
Question 4Researchers have found that children who attend daycare ________ children reared at home.
a. are more avoidantly attached than c. are more securely attached than
b. are less ambivalently attached than d. do not differ in attachment from
Question 5David has not yet shown signs of PKU and is already being treated. This is because his PKU was detected by
a. a blood test. c. the parents.
b. the age of ten years. d. the first trimester of gestation.
Question 6Why might the effects of daycare on attachment be so difficult to assess?
a. Many variables operate when a child receives nonparental care.
b. Tremendous variation in caregiving schedules makes it difficult to conduct controlled experiments.
c. Nonparental care options encompass a wide range of choices.
d. All of these.
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