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Free_Kalibri [48]
3 years ago
8

Changes in the gene pool can occur due to various mechanisms. From 1892 to 1954, millions of individuals emigrated (moved out) f

rom countries across the Atlantic Ocean to the United States. Many of these individuals entered through Ellis Island, a federal immigration station in New York. Which mechanism affected the gene pool of the immigrants that entered the United States through Ellis Island?
Biology
2 answers:
Sophie [7]3 years ago
8 0
The correct answer for this mechanism is gene flow: gene flow is the mechanism of a change in the gene composition in a population as a result of migration.

The migration from other countries into the Us was an example of a large-scale migration, so it resulted in a gene flow.
NNADVOKAT [17]3 years ago
4 0
The mechanism that affected the gene pool of the immigrants that entered the United states Through Ellis Island is Gene flow.

Gene flow involves the movement of genes or alleles between interbreeding populations of a particular species. In other words it is the movement of genes from one population to another population. Actually it may be an important aspect of evolution; evolution can occur as a result of genes being transferred from one population to another. Gene flow occurs when there is migration, since the loss or addition of people can easily change pool frequencies even without no other evolutionary mechanisms operating.  
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When examining cells in the laboratory, you notice that a particular cell has half as much DNA as the surrounding cells. This ob
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Answer:

G1

Explanation:

The cell cycle is divided into 2 main phases namely:

  • The interphase
  • The m phase

While the m phase is the active division phase, the interphase is further divided into:

  • G0 phase which is essentially a resting or quiescence phase for cells that do not need to divide ordinarily.
  • G1 phase which is characterized by growth and development of the cell.
  • S phase which is a phase during which DNA is synthesized
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<em>Hence, if a cell is noticed to have half as much DNA as the surrounding cells, it means that particular cell's cell cycle halted at G1. The cell has not been able to synthesize DNA unlike the surround cells.</em>

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3 years ago
Phytoplankton, shown on the left in the image below, are microscopic organisms that can be found in freshwater and salt water en
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Answer:

The whale is heterotrophic.

Explanation:

Energy is needed by organisms to perform their life functions. Organisms, in nature, feed on one another for energy source. Some organisms are, however, capable of synthesizing their own food or energy source via a process called photosynthesis. This is the case of the phytoplankton in the question. These organisms are, therefore, called AUTOTROPHIC ORGANISMS or PRODUCERS.

On the other hand, some organisms are incapable of this self-production of energy source. Hence, they rely on other organisms for it. These category of organisms are called HETEROTROPHIC organisms, which is the category the large whale fall into due to its dependence on phytoplankton for energy source.

4 0
3 years ago
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Each presynaptic terminal contains ___________, which contain the neurotransmitter __________ that, when released, cause ligand-
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Answer:

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Explanation:

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  2. The action potential causes the opening of the voltage dependent calcium channels in the axon terminal of the neuron allowing the entry of calcium ions.
  3. This causes the neurotransmitter vesicles containing the neurotransmitter acetylcholine to fuse with the pre-synaptic membrane.
  4. Acetylcholine is released by the method of exocytosis into the synaptic cleft.
  5. The acetylcholine molecules bind to the the cognate receptors present in the membrane of the muscle cell (sarcolemma).
  6. This causes the flow of sodium ions into and potassium ions out of the muscle cell, which generates action potential in the muscle cell.
  7. This action potential causes the muscle cell to contract.

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