A genetic abnormality that may result in sterile
males with some mental impairment or breast
enlargement is
a. XXY.
b. XYY.
c. Turner syndrome.
d. Down syndrome.
e. none of these.
Answer: a
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Myelination of neurons in the brain is the product of:
A. Schwann cells. B. oligodendrocytes. C. astrocytes. D. both Schwann cells and oligodendrites.
Semen contains all of the following EXCEPT ____
a. sperm b. acidic secretions c. prostaglandins d. fructose e. mucus-rich secretions
For a physical map of a chromosome, distances are measured in units of:
A. centiMorgans. B. contigs. C. map units. D. RFLPs. E. base pairs.
The hundreds of species of Drosophila in Hawaii exhibit different mating rituals. This isolating mechanism is
A. postzygotic and mechanical. B. prezygotic and ecological. C. prezygotic and behavioral. D. prezygotic and geographical. E. prezygotic and temporal.