Janelle inherited the allele for muscle fiber X (MFX) disorder from her mother and the normal allele for muscle fiber formation from her father. Janelle does not suffer from any variant of MFX disorder. What can we conclude?
a. Janelle’s mother has MFX disorder.
b. MFX disorder is a sex-linked disorder.
c. The MFX gene is dominant.
d. The MFX gene is recessive.
ANSWER:
d
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Paul, a textbook author reviewing previous studies, finds that researchers using brain imaging techniques to study autism have found evidence for all of the following except
a. the brains of children with autism process social stimuli differently than the brains of comparison children without autism b. brain activity in children without autism changes in response to certain characteristics of speech samples, but brain activity in children with autism does not change in response to the same samples c. deficits in theory of mind are the underlying cause of autism d. children with autism show a preference for nonspeech signals rather than speech samples – the opposite of the pattern that is usually found in children without autism
Which of the following individuals illustrates a person who is closer to the peak of their reaction range?
a. Samir was born with a potential IQ of 145 (gifted IQ), was raised in an educationally enriching environment, and is a highly motivated learner. Correct. Reaction range proposes that genetics establish limits, whereas one's environment places them on that scale. This means that Samir was born with a potential of an IQ of 145 and he is living within an environment that allows him to reach his fullest potential. b. Joseppi, who was born with a potential IQ of 145 (gifted IQ), was raised in an educationally deprived environment and is an unmotivated learner. Incorrect. Joseppi has the genetic potential; however, his environment is limiting. c. Susan was born with the potential IQ of 80 (below average IQ), was raised in an educationally deprived environment and is an unmotivated learner. d. Iman, who was born with the potential IQ of 80 (below average IQ), was raised in an educationally enriching environment and is an unmotivated learner who makes little progress.