Briefly describe the difference between adaptation from new mutation and adaptation from standing genetic variation in natural populations
What will be an ideal response?
Adaptation from new mutation occurs when a novel adaptive allele appears in a population after a new selective challenge (such as an environmental change arises; the new mutation is favored by natural selection and spreads through the population. Adaptation from standing genetic variation occurs when an allele that was already present at low frequency within a population is favored by a new selective challenge that comes later; the pre-existing allele then rises to fixation in the population because it is favored by natural selection.
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Which structures lining the tissue surface of the respiratory tract can be damaged by airborne particles?
A) cilia B) alveoli C) bronchi D) capillaries
How can you prevent warts from spreading?
A. Maintain good hygiene. B. Do not pick at them. C. Do not share towels with someone who has them. D. All of the choices are correct. E. Avoid shaving over them.
Which of the following equations displays the correct relationship?
a. indirect fitness + direct fitness = inclusive fitness b. inclusive fitness + direct fitness = indirect fitness c. indirect fitness + inclusive fitness =direct fitness d. direct fitness – inclusive fitness = direct fitness
The stimulation of a motor neuron ultimately results in the release of a neurotransmitter at the synapse between the neuron and a muscle cell. What type of neurotransmitter is used at these neuromuscular junctions?
(a) acetylcholine (b) glutamate (c) GABA (d) glycine