Four of the five answers listed below are chromosomal abnormalities. Select the exception
a. translocation
b. elongation
c. duplication
d. deletion
e. inversion
B
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Which of the following statements about spermatogenesis is false?
A. Sperm are motile as soon as they are produced. B. Secondary spermatocytes and spermatids are linked together by cytoplasmic bridges. C. Spermatogenesis takes 2–3 months. D. Sperm are produced continuously within the seminiferous tubules. E. None of the answer options is false.
Huffaker's experiment involving oranges showed
A) predators will always consume prey to extinction. B) prey will always outlast predators. C) with enough complexity, predator and prey populations will oscillate. D) both species use oranges for refuge.
Why do neurons need glial cells?
What will be an ideal response?
In small populations, gene frequencies can change drastically by chance alone. This phenomenon is called
A. density-dependent effects. B. migration. C. density-independent effects. D. genetic drift.