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Natasha2012 [34]
2 years ago
13

Bacillus thuringienses (Bt) bacteria produce a natural insecticide. Widespread use of Bt has lead to Bt resistance among insects

. Why is this occurring?
Biology
1 answer:
Arturiano [62]2 years ago
5 0

Answer:

Some insects with Bt resistance genes are able to survive in the presence of Bt toxin. Natural selection favors these insects and increases their proportion in future generations.

Explanation:

Some of the insects in the insect population have one or more genes that impart Bt resistance to them. These insects are able to survive in the presence of Bt toxin while the ones that lack these genes simply die by Bt toxin. Natural selection allows these insects to leave more progeny in the future generation which in turn results in increased frequency of the Bt resistance gene in the future populations. This results in the spread of Bt resistance among insect populations.

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The inherited factors that determine traits are called
Marina CMI [18]
The traits an organism displays are ultimately determined by the genes it inherited from its parents, in other words by its genotype. Animals have two copies of all their chromosomes, one from each parent
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2 years ago
Which of the following characteristics, structures, or processes is common to both bacteria and viruses? A. Metabolism B. Riboso
Darina [25.2K]

Answer:

C. Genetic material composed of nucleic acid

Explanation:

The information needed by every organism to perform life functions like reproduction, growth etc are held in the genetic material that the organism carries in its genome. Every genetic material of organisms is composed of nucleic acids, which are only two in nature i.e. Ribonucleic acid (RNA) and Deoxyribonucleic acid (DNA). This is a common feature of all organisms including bacteria and viruses that they contain genetic material which must be in form of a nucleic acid.

The viruses do not undergo a cell division, neither do they contain protein synthesis structures called Ribosomes because they do not have the ability to reproduce or perform any living process outside a living host cell. This means that they strictly depend on another organism's transcriptional, translational, replicational ability to survive.

4 0
2 years ago
The flowchart below shows the three generations of a cross between a pea plant that has yellow pods and a pea plant that has gre
tresset_1 [31]

Hello. This question is incomplete. Also, you forgot to show the flowchart. The flowchart is attached below and the full question is:

The flowchart below shows the three generations of a cross between a pea plant that has yellow pods and a pea plant that has green pods. Green pods are the dominant trait. The flowchart is missing the labels that describe the traits.

In which squares should the phrase “Green pods” appear?

1.A and D  2.B and E  3.A,C and D  4.A,B,C,D and E

Answer:

3.A,C and D

Explanation:

As shown in the question above, the flowchart shows the crossing of a pea plant with dominant features (green pods - AA) and a pea plant with recessive features (yellow features - aa). The crossing between plants with AA and aa alleles generates a completely Aa population, which in this case, has the dominant characteristic, that is, it has green pods. This is because the "Aa" alleles are called heterozygous and develop the dominant characteristic.

As we can see in the flowchart, the crossing between the two pea plants generated an offspring that is identified by table C, as we know this offspring has green pods and in the flowchart it is represented by a grayish rectangle. Therefore, we can say that the other gray rectangles represent pea plants with green pods, which are rectangles A, C and D.

4 0
2 years ago
The ancient remains of plants preserved in the earth in the form of coal, oil, and natural gas are called
goldfiish [28.3K]
The remains of plants and animals preserved in the earth => fossils
coal, oil, natural gas => fuels

fossil fuels
6 0
2 years ago
The gray matter in the spinal cord is located in the ____________ , and its shape resembles a letter H, or a butterfly. The cell
mariarad [96]

Answer:

The gray matter in the spinal cord is located in the <u><em>grey column</em></u> , and its shape resembles a letter H, or a butterfly. The cell bodies of somatic motor neurons are primarily housed in the <u><em>ventral or anterior</em></u> horns, which innervate skeletal muscle.

Explanation:

The grey matter is a component of the central nervous system that contains neuronal and glial cells and it can be found in the brain, brainstem and <em>spinal cord, in this last one, is found in the grey column, a mass of grey matter shaped in H form.</em>

In this column the grey matter is divided into four columns (as you can see in the image I added):

  • The dorsal or posterior horn: contains somatosensorial neurons
  • <em> The ventral or anterior horn: contains somatic efferent motor neurons (they exit the spinal cord to innervate skeletal muscle) </em>
  • The intermediate column: contains neurons to innervate visceral organs
  • The lateral horn: same as the intermediate column

I hope you find this information useful and interesting! Good luck!

6 0
2 years ago
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