The original source of all genetic variation is _____.

A) mutation
B) meiosis
C) a need for new traits
D) natural selection
E) recombination


Ans: A) mutation

Biology & Microbiology

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In total, a sensory system includes:

a. a sensory receptor b. nerve pathways from the receptor to the brain c. brain regions where the sensory information is processed d. a sensory receptor and nerve pathways from the receptor to the brain only e. a sensory receptor and nerve pathways from the receptor to the brain regions that process the information

Biology & Microbiology

Rape (the plant from which canola oil is produced), sunflowers, and soybeans have been genetically modified to

enhance production of ____________________ fatty acids. Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Increasing the flow of Na+ ions into a neuron at rest (-70 mV initially) would trigger

A. active transport. B. hyperpolarization. C. depolarization. D. repolarization. E. None of the choices are correct.

Biology & Microbiology

If a chromosome in one of your bone cells becomes mutated, you will not pass this mutation onto your children because

A. somatic cells cannot undergo mitosis. B. germ cells cannot undergo meiosis. C. germ cells cannot undergo mitosis. D. somatic cells cannot undergo meiosis.

Biology & Microbiology