Most cases of colorblindness result from abnormal recessive genes located on the X chromosome that are not duplicated on the Y chromosome. Which of the following statements accurately predicts the outcome for the children of a father with typical genes and a mother with abnormal genes?
a. Half of the couple's daughters, but none of their sons, are likely to be colorblind
b. Half of the couple's sons, but none of their daughters, are likely to be colorblind.
c. None of the couple's children are likely to be colorblind.
d. All of the couple's children are likely to be colorblind.
b
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According to the textbook, the oldest drug made by humans is:
A. mescaline B. psilocybin C. alcohol D. nicotine
How do sound waves ultimately result in the production of receptor potentials? a. The tectorial membrane squeezes the auditory nerve
b. The basilar membrane releases neurotransmitters. c. Hair cells in the cochlea vibrate, causing ion channels to open in their membrane. d. The scala vestibuli has receptors that create action potentials.
The _______________ is the most recently evolved part of our brains and is associated with such complex abilities as reasoning, decision making, and planning
a. limbic cortex b. somatosensory cortex c. prefrontal cortex d. thalamic cortex
The genetic characteristics of recessive genes
a. tend to mask the characteristics of dominant genes. b. are always expressed in the phenotype. c. are usually codominant. d. tend to be masked by the characteristics of dominant genes.