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cestrela7 [59]
3 years ago
15

In northern Canada, a population of rabbits was predominantly white in color. The allele for white color is recessive while the

allele for gray color is dominant. Over the last several decades, the average annual temperature of this area has increased and the long-term deposits of ice and snow have become scarce. In this case, the frequency of a previously rare allele becomes more frequent in the population. This is an example of
A) nonrandom selection.
B) disruptive selection.

C) directional selection.
Eliminate

D) stabilizing selection.
Biology
2 answers:
lesya692 [45]3 years ago
7 0
Its C) directional selectiton
jolli1 [7]3 years ago
3 0

Answer:

The correct answer is option C) "directional selection".

Explanation:

Directional selection is a type of natural selection characterized by extreme characteristcs of a trait being favored over medium ones. The genetics behind directional selection are based on an allele being favored over the others, either by environmental or biotic conditions. The rabbits in northern Canada is an example of directional selection because a previously rare allele becomes favored due to a change in the environmental conditions. Therefore, the rare allele is selected and now becomes more frequent in rabbits.

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In both skeletal and cardiac muscle, not smooth muscle, because of the way that the muscle fibers are conformed into tight bundles of sarcomeres (skeletal muscle) and myocardiocytes (cardiac muscle), there is a need for a series of structures that will ensure that when there is a stimulus from the nervous systems, these stimulus will propagate to all the cells in the fibers, and not just one.

Aside from counting with a neuromuscular motor plate, which will receive the neurotransmitter from the nerve endings and produce the appropriate reactions, as well as propagate that reaction to all the cells that are being stimulated, muscle fibers also have a structure known as T-Tubules. T-Tubules are formations much like roadways of cell plasma membrane that connect not just one, but all the cells within a muscle fiber so that once a stimulus comes, all the cells will initiate the process of calcium release and action potential propagation. These T-Tubules will ensure that electrical impulses reach all muscle cells and that all cells react at the same time as needed.

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