A summer occupation in the Corn Belt states is de-tasseling the corn: removing unwanted male flowers so that female flowers on the same plant are pollinated by the desired pollen for the hybrid corn
What does this tell you about corn? The flowers are _____. A) perfect and the plant is dioecious
B) perfect and the plant is monoecious
C) imperfect and the plant is dioecious
D) imperfect and the plant is monoecious
D
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Over a long period of time, you would expect a neutral mutation to __________ within a large population
A. increase in frequency B. decrease in frequency C. increase or decrease in frequency D. remain at the same frequency
How do temporal and spatial summation improve the processing power of the brain?
A. Temporal summation allows circadian rhythms to regulate neuronal activity. Spatial summation allows latitude to regulate neuronal activity. B. Temporal summation allows a neuron to fire prolonged action potentials, and spatial summation allows a neuron to synapse onto new targets. C. Temporal and spatial summation both make the neuron more likely to fire action potentials. D. Temporal summation allows a neuron to recognize a persistent signal from a single presynaptic cell, and spatial summation allows a neuron to recognize a broad signal from multiple presynaptic cells. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content/Choose Answer · What do you already know about summation? What other information is related to the question? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Impressive was a champion Quarter Horse stallion with a magnificent muscular physique, a trait that he passed on to dozens of offspring. However, many of Impressive's offspring developed periodic muscular twitching that sometimes left the horses temporarily unable to move. Some horses even died. As it turns out, Impressive's award-winning physique was due to a mutation in a single, protein-encoding gene, resulting in hyperexcitable muscle (which contracts even in the absence of a stimulus from its motor neuron). Which is NOT a plausible explanation for the identity of the abnormal muscle protein in Impressive and his offspring?
A. tropomyosin that is unable to bind to actin B. acetylcholine receptors that function in the absence of acetylcholine C. over-active troponin molecules D. leaky Na+ channels E. overactive Ca2+ pumps in the membrane of the sarcoplasmic reticulum Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you know about excitation of muscles? What other information is related to the question? Choose Answer · Given what you now know, what information is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
If C is dominant to c, what fraction of offspring will be homozygous when two heterozygous parents are crossed?
a. 0/4 b. 1/4 c. 2/4 d. 3/4 e. 4/4