Which of the following does NOT produce variation?
A) Crossing over
B) Sexual reproduction
C) Genetic recombination of alleles
D) Asexual reproduction
E) Random alignment of chromosomes during meiosis
D
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Which of the following correctly describes the reproduction of males in Daphnia?
A) Daphnia males are produced asexually from unfertilized eggs. B) Daphnia males are produced sexually through fertilization of eggs but are sterile from birth. C) Daphnia males are produced from a pseudo-sexual union of two eggs. D) Daphnia males are produced asexually but are sterile from birth.
Gram-positive bacteria have ____ and appear
____ under the microscope. a. thick walls; pink b. thick walls; purple c. thin walls; pink d. thin walls; purple e. none of these
The Keeling curve depicted here has an annual cycle. What is the primary cause of this cycle?
What will be an ideal response?
The virus that causes AIDS is the ________ virus.
What will be an ideal response?