Jake is an only child. He often pretends to have an imaginary brother, "Jack," who plays with him. Jake's play shows
A) expression of needs.
B) reversal of roles.
C) outlet for forbidden impulses.
D) parallel play.
A) expression of needs. Sociodramatic play gives children a chance to express unmet needs.
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The use of which of the following drugs has been linked to the growth of breast cysts, miscarriages, bladder cancer, heart problems, and high blood pressure?
a. caffeine b. cocaine c. nicotine d. heroin
When examining the transmission of phenylketonuria (PKU), a recessive trait, we can clearly identify the ___________ when a child is afflicted with PKU
For the child not afflicted with PKU, we can only identify the ___________, since the child may or may not be a carrier. a. genotype; phenotype c. X-linked genes; Y-linked genes b. phenotype; genotype d. Y-linked genes; X-linked genes
Damage to the medulla can seriously impair one's ability to
a. sing. b. write. c. breathe. d. metabolize food.
All but which of the following methods is commonly used in genetic research?
a. Comparing magnetic resonance imaging scans of parents and children b. Comparing prevalence rates of a disorder among relatives of affected youth c. Calculating concordance rates between identical and fraternal twins d. Examining the co-occurrence of disorders in biological and adoptive relatives e. All of the above are methods commonly used in genetic research