Male frogs give calls that attract female frogs to approach and mate. Researchers examined mating calls of closely related but separate species of tree frogs in South America
What outcomes could possibly occur where the ranges of two species overlap?
I) The species will interbreed, eventually fusing over time.
II) A stable hybrid zone will form if hybrids are better adapted to the area of overlap than either parent species is.
III) Species will continue to diverge and be isolated by behavioral or genetic mechanisms.
A) I
B) II
C) III
D) I, II, and III
D
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Chemical synthesis of DNA:
A. requires attachment of a starting nucleotide to a glass or polystyrene bead through its 5' phosphate. B. proceeds in the 5' to 3' direction. C. requires transient protection of the nucleotide's functional groups by chemical modification.These protective modifications are reversible. D. requires that the chemical group used to protect the 3'OH of the pentose is removed at the beginning of each cycle. E. can be used to synthesize small chains of nucleotides up to 10 bases.
Examine the pedigree in the figure above, where individuals that have the genetic condition being
tested are marked with filled squares or circles. Which of the following inheritance patterns is most likely correct for this condition?
a. autosomal dominant b. X-linked recessive c. X-linked dominant d. cytoplasmic inheritance e. autosomal recessive
Mitotic activity by the apical meristem of a root makes which of the following more possible?
A) increased delivery of water to the aboveground stem B) decreased absorption of mineral nutrients C) increased absorption of carbon dioxide. D) effective lateral growth of the stem
You are driving at night and decide to pass a slow-moving car. You notice that although you can see the car, you can't tell what color it is. This is due to
A) the poor ability of cones to function in low light. B) the poor ability of rods to function in low light. C) a reduced ability to focus in low light situations. D) the constriction of your pupil in low light situations, which reduces color vision.