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Marina86 [1]
1 year ago
8

A mutation in which one nucleotide in the dna sequence is substituted for another nucleotide is referred to as a ________ mutati

on
Biology
1 answer:
stepan [7]1 year ago
4 0
The answer is a point mutation
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Which tool is most likely to be used to produce a clear image of very tiny structures inside a cell? a light microscope b electr
FrozenT [24]

<em>Electron microscope </em><em>is most likely to be used to produce a clear image of very tiny structures inside a cell</em>

Answer: <em>B. Electron microscope</em>

Explanation:

The electron microscope is a kind of magnifying instrument that utilises electrons to make a picture of the objective. It has a lot higher amplification or settling power than a typical light microscope. The tiny structures inside the cell are easily visible under the electron microscope.

The electron microscope can be scanning electron microscope or tunnelling electron microscope. Both the type of electron microscopes differ in function but uses electron as its source of illumination.

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2 years ago
Where do most of the nerve fibers of the sympathetic division of the autonomic motor pathways arise from?
Gnom [1K]

Most of the nerve fibers of the sympathetic division of the autonomic motor pathways arise from the inter-mediolateral horns of the gray matter of spinal cord.

<h3>What is sympathetic nervous system ?</h3>

The autonomic system is up two types such as the sympathetic and parasympathetic systems.

Both subsystem work antagonistically but in an integrated manner.

Sympathetic system is highly essential for preparing our body during emergencies for 3 F responses such as fight, fright and flight.  

During this response, sympathetic system activates complex pathways for faster breathing, increased heart rate and blood pressure.

Hence, the inter-mediolateral horns of the gray matter of spinal cord is correct answer.

Learn more about nervous system, here:

brainly.com/question/17520523

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5 0
1 year ago
For a series of experiments, a linkage group composed of genes W, X, Y and Z was found to show the following gene combinations.
Gelneren [198K]

Complete question:

For a series of experiments, a linkage group composed of genes W, X, Y and Z was found to show the following gene combinations. (All recombinations are expressed per 100 fertilized eggs). Construct a gene map. Determine the sequence of genes on the chromosome.

  • w-x = 5
  • w-y = 7
  • w-z = 8
  • x-y = 2
  • x-z = 3
  • y-z = 1

Answer:

The sequence of genes on the chromosome is:

----W-------------------------X-----------Y------------Z---

Explanation:

First, we need to know that 1% of recombination frequency = 1 map unit = 1cm. And that the maximum recombination frequency is always 50%.  

The map unit is the distance between the pair of genes for which every 100 meiotic products, one results in a recombinant one.  

The recombination frequencies between two genes determine their distance in the chromosome, measured in map units. So, if we know the recombination frequencies, we can calculate distances between the four genes in the problem and we can figure the genes order out. This is:

Recombination frequencies:  

1% of recombination frequency = 1 map unit (MU)

  • w-x = 5 MU
  • w-y = 7 MU
  • w-z = 8 MU
  • x-y = 2 MU
  • x-z = 3 MU
  • y-z = 1 MU

Now that we know the distances, we just need to analyze them to find out the correct order of the genes. First, we can look for the biggest distance, which tells us which genes are located in the extremes. w-z distance is the biggest one, so these two genes are in the extremes of the chromosome segment. ---W----------------------------------------------Z---

                     ∫---------------------8 mu-------------------∫

The rest of the genes are located in the middle between these two.

The second biggest distance is between w-y (7 mu). Y is also 1mu distant from Y. 7 mu + 1 mu = 8 mu. So, Y is located closer to Z.

---W-------------------------------------Y------------Z---

    ∫-----------------------7 mu---------∫∫---1 mu--∫

    ∫---------------------8 mu-------------------------∫

w-x = 5 mu, and x-y = 2mu, so x is located between w and y. The sum of these distances equals the distance w-y ( 5 mu + 2 mu = 7 mu). So,

---W-------------------------X----------Y------------Z---

    ∫-----------5 mu -------∫∫--2mu--∫

    ∫-----------------------7 mu---------∫∫---1 mu--∫

    ∫---------------------8 mu-------------------------∫

We know that the distance between x-y equals 2, and the distance between y-z equals 1. Also, the distance between x-z equals. This leads us to assume that Y is located between X and Z.

----W-------------------------X-----------Y------------Z---

    ∫-----------5 mu -------∫∫--2mu--∫∫----1mu---∫

                                     ∫------ 3 mu-----------∫

    ∫-----------------------7 mu---------∫∫---1 mu---∫

    ∫---------------------8 mu--------------------------∫

   

7 0
3 years ago
A _______ is a segment of the DNA molecule that carries the genetic code to make a protein.
Ipatiy [6.2K]
The answer is gene.
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3 years ago
Both active solar heating systems and passive solar heating systems
const2013 [10]

Answer:

Hmm.

Explanation:

C. Reduce the need to use fossil fuels

( If it's not C, then try D)

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2 years ago
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