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melisa1 [442]
4 years ago
9

The source of most variations come from

Biology
2 answers:
sergiy2304 [10]4 years ago
4 0
<h2>Answer:</h2>

<u>The sources of genetic variations is </u><u>mutation</u>

<h2>Explanation:</h2>

Various mutations are the ultimate source of genetic variations. Mutations are likely to be rare and most mutations are neutral or deleterious. There are several sources of variations but the two main sources of genetic variation are mutations and re combinations of genes which takes place as a result of sexual reproduction. A mutation is a permanent change in the DNA within a gene.

Arturiano [62]4 years ago
3 0

The random genetic combinations during chromosome crossover during meiosis

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David brought home a leaf cutting from a plant. He potted the cutting, and it grew into a full plant. What can you conclude abou
Arlecino [84]
Uh...that it will have the same genetic makeup as the plant it came from? or that it's asexual? dont really know what u need here.
3 0
3 years ago
Read 2 more answers
List and explain the 3 paths natural selection can take.
evablogger [386]

Answer:

1. Stabilizing Selection  

2. Directional Selection  

3. Disruptive Selection  

Explanation:

Stabilizing Selection  

This type of natural selection occurs when there are selective pressures working against two extremes of a trait and therefore the intermediate or “middle” trait is selected for. If we look at a distribution of traits in the population, it is noticeable that a standard distribution is followed:

Example:  For a plant, the plants that are very tall are exposed to more wind and are at risk of being blown over. The plants that are very short fail to get enough sunlight to prosper. Therefore, the plants that are a middle height between the two get both enough sunlight and protection from the wind.

Directional Selection  

This type of natural selection occurs when selective pressures are working in favour of one extreme of a trait. Therefore when looking at a distribution of traits in a population, a graph tends to lean more to one side:

Example: Giraffes with the longest necks are able to reach more leaves to each. Selective pressures will work in the advantage of the longer neck giraffes and therefore the distribution of the trait within the population will shift towards the longer neck trait.

Disruptive Selection  

This type of natural selection occurs when selective pressures are working in favour of the two extremes and against the intermediate trait. This type of selection is not as common. When looking at a trait distribution, there are two higher peaks on both ends with a minimum in the middle as such:

Example: An area that has black, white and grey bunnies contains both black and white rocks. Both the traits for white and black will be favored by natural selection since they both prove useful for camouflage. The intermediate trait of grey does not prove as useful and therefore selective pressures act against the trait.

6 0
3 years ago
Which hypothesis most likely explains the results at 60°C and 70°C? O A. The substrate has been used up because of the high temp
Leni [432]

Answer: Option B

The enzyme has changed shape because of high temperature.

Explanation:

Enzymes are biological catalysts in living organisms that speed up the rate of chemical reactions.

High temperature changes the shape of enzymes.

Increase or high temperature lead to decrease in enzymes activities. This is due to enzyme protein been denatures by high temperature which is the breaking of molecular bonds within the enzyme protein. When the enzymes bonds are broken, the shape of the enzymes changes and they no longer act as catalysts.

5 0
3 years ago
Write a five sentence paragrgh explaining the cell cycle
Nady [450]

Answer:

The cell cycle is a cycle of stages that cells pass through to allow them to divide and produce new cells. It is sometimes referred to as the “cell division cycle” for that reason.

New cells are born through the division of their “parent” cell, producing two “daughter” cells from one single “parent” cell.

Daughter cells start life small, containing only half of the parent cell’s cytoplasm and only one copy of the DNA that is the cell’s “blueprint” or “source code” for survival. In order to divide and produce “daughter cells” of their own, the newborn cells must grow and produce more copies of vital cellular machinery – including their DNA.

The two main parts of the cell cycle are mitosis and interphase.

Mitosis is the phase of cell division, during which a “parent cell” divides to create two “daughter cells.”

The longest part of the cell cycle is called “interphase” – the phase of growth and DNA replication between mitotic cell divisions.

Both mitosis and interphase are divided into smaller sub-phases which need to be executed in order for cell division, growth, and development to proceed smoothly. Here we will focus on interphase, as the phases of mitosis have been covered in our “Mitosis” article.

Interphase consists of at least three distinct stages during which the cell grows, produces new organelles, replicates its DNA, and finally divides.

Explanation:

from online, rephrase this use as reference

5 0
3 years ago
A student identifies the following parts of a cell.
Molodets [167]

Answer:

mitochondrion becoz it is a membrane bounded organelle which is only present in eukaryotic cell

3 0
3 years ago
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