While lying awake in bed, you stare at your ceiling, watching a faint sparkling, shimmering movement in the pitch darkness around you. What causes this phenomenon in the absence of visible light?
a. Myopia makes near infrared light perceivable.
b. The cosmic microwave background is faintly visible.
c. Tonic activity generates illusory visual activity.
d. Degeneration of the optic nerve creates false images.
c. Tonic activity generates illusory visual activity.
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If a species has 42 pairs of chromosomes, which value represents the number of combinations of
maternal and paternal chromosome combinations that will be sorted to the poles?
a. 422 b. 242 c. 221 d. 212 e. 842
Eukaryotic cells contain membrane bound
___________ in their cytoplasm. Fill in the blank(s) with the appropriate word(s).
The two major forces contributing to allopatric speciation are:a
mutation and natural selection. b. natural selection and migration. c. nonrandom mating and migration. d. natural selection and genetic drift. e. genetic drift and mutation.
What does a frequency of recombination of 50% indicate?
A) The two genes are likely to be located on different chromosomes. B) All of the offspring have combinations of traits that match one of the two parents. C) The genes are located on sex chromosomes. D) Abnormal meiosis has occurred.