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zlopas [31]
3 years ago
15

During which stage of sleep are the major postural muscles most relaxed

Biology
1 answer:
Ksivusya [100]3 years ago
7 0
At The Middle Stage We Get More Pleasure........!!!!!!
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Natural Selection: Mastery Test
Finger [1]

Answer:

Genetic diversity in a small population, with a high level of genetic drift and with very little migration will decrease because existing alleles will be lost and few new alleles will be introduced over time (option A).

Explanation:

Evolution - linked to the natural selection and perpetuation of a species - depends, in large part, on three fundamental factors to make it happen:

  • Mutations .
  • Genetic drifts.
  • Migrations.

In small and isolated populations, very little genetic variation, high levels of genetic drift and very few mutations can be observed, which could lead to some alleles being lost and the species may become extinct.

Genetic drift (GD) is an important factor in terms of natural selection, as it is the result of allelic variations that occur from one generation to another. In large populations, GD is low, given the cross between different individuals is greater. A characteristic of GD in small populations is that their levels are very high, and this leads to the eventual loss of alleles.

In this small population, without the possibility of migration -few new alelles will be introduced- genetic variation will decrease, due the genetic flow is low, reducing reproductive fitness and weakening the population's resistance to environmental changes, which could result in the long-term extinction of the species.

Learn more:

Genetic drift brainly.com/question/6389220

8 0
3 years ago
How are stem cells currently being used in the laboratory?
IRISSAK [1]

Answer:

Stem cell is the special type of cell that can differentiate to give any cells in the body. Cell therapy nowadays are using stem cell in order to replace damaged tissue.

Researchers are finding out ways to treat diseases like diabetes, Parkinson's, spinal cord injury and heart injury etc. These cells have the ability to repair damaged heart cells after a heart attack. They can also treat neurological problems.





5 0
2 years ago
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PLEASE ANSWER QUICKKK, ILL MARK BRAINLIEST
NikAS [45]

Answer:

1. Meanders

2. Flood plain zone

3. Alluvial fan

4. source zone

5. transition zone

6. Deltas

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A scientist has chosen to study how rain can cause flooding along the Mississippi River. Which type of model is most appropriate
masha68 [24]
Is there a list of answers you can choose from?
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Which is not a characteristic of homologous chromosomes?
Yakvenalex [24]

Answer:

C. exact same type of alleles

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