The failure of chromosomes to separate during mitosis or meiosis is called
A. genetic displacement.
B. trisomy.
C. crossing over.
D. nondisjunction.
E. disjunction.
Answer: D
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Synaptic vesicles discharge their contents by exocytosis at the
A. dendrite. B. axon hillock. C. nodes of Ranvier. D. postsynaptic membrane. E. presynaptic membrane.
Which of the following is NOT one of the types of variation that occurs within individuals?
A) genetic variation B) environmental variation C) normalizing variation D) genotype-by-environment variation
Which is a symptom of a transmissible spongiform encephalopathy (TSE)?
a. influenza-like symptoms b. progressive immune deficiency c. degeneration of the digestive tract d. inflammation of the reproductive organs e. degeneration of the brain and central nervous system
Assume that a black guinea pig crossed with an albino guinea pig produced 5 black offspring. When the albino was crossed with a second black guinea pig, 4 black and 3 albino offspring were produced. What genetic explanation would apply to these data?
A) albino and black = codominant B) albino = dominant; black = incompletely dominant C) albino = dominant; black = recessive D) albino = recessive; black = recessive E) albino = recessive; black = dominant