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raketka [301]
4 years ago
14

How many chromosomes do most human cells contain?

Biology
2 answers:
lidiya [134]4 years ago
8 0

Answer:

C. 23 pairs of chromosomes

Explanation:

Human beings are sexually reproducing organisms that are produced as a result of

the fertilization of gametes. The cells in a human body can either be somatic or sex cells. Somatic cells are body cells and occupy majority of the cells in humans. Sex cells or gametes are only used during reproduction.

The somatic cells of humans contain 23 pairs of chromosomes or 46 chromosomes. This chromosomes undergo meiosis to produce gametes which contains half the number of the normal chromosomes i.e. haploid, 23 chromosomes.

Hence, when haploid male and female gametes (sperm and egg respectively) come together during fertilization, they produce a diploid cell with 23 pairs of chromosomes (46 chromosomes) i.e. 23 chromosomes in sperm + 23 chromosomes in egg = 46 chromosomes or 23 pairs in zygote.

Thus, most cells in humans except sex cells or gametes contain 23 pairs of chromosomes.

alexgriva [62]4 years ago
6 0
The correct answer is c
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Explain how life history traits vary with environmental conditions and with population density
schepotkina [342]
They vary on shape reproduction patterns in species. Traits that affect a organism's schedule of reproduction, selective pressures vary so life histories are very diverse. Life history traits are products of natural selection and an organisms life history comprises the traits that affect schedule of reproduction and survival, and also the traits are evolutionary outcomes reflected in the envelopment, physiology and behavior.
6 0
4 years ago
The long bundle of neurons that carries messages to and from the body to the brain and is responsible for very fast, lifesaving
olga2289 [7]

The long bundle of neurons that carries messages to and from the body to the brain and is responsible for very fast, lifesaving reflexes is called the<u> spinal cord. </u>

<h3>What is the espinal cord?</h3>

There are two organs involved in the central nervous system that function as control centers,

  • The brain,
  • The spinal cord.

The spinal cord is a nerve tube placed in a hollow space left between vertebras along the vertebral column. The vertebrae's body protects the spinal cord.

It is made of nerves that take orders from the brain to the rest of the body and send messages from the body to the brain.  

Reflexes acts are produced in the medulla, and the brain is not involved.

The nervous cells of the medulla have fibers that extend from the medulla to the body and are connected to sensory receptors.

When receptors receive stimuli, they send information to the nerve fibers, which take it to the brain. From the brain, they send a response.

The answer is spinal cord.

You can learn ore about the spinal cord at

brainly.com/question/6957362

brainly.com/question/15707666

6 0
3 years ago
Earth's climate systems are driven by the electromagnetic radiation from the sun, as wells as its reflection, absorption, storag
ivann1987 [24]

Answer:

(A) True

Explanation:

The sun is producting the electromagnetic radiation which is the primary energy source on Earth and the driver of the entire climate system.

In general the sun is the source of energy that drives all life on Earth. This energy governs the weather, ocean currents and the hydrological cycles.

Without the continuous influx of sunlight and heat, life on Earth would cease to exist. The sun sets off the hydrological cycle, causing it to constantly evaporate into the atmosphere, from which it falls back to Earth.

8 0
4 years ago
What might be one benefit of reading science fiction?
dexar [7]

Answer:

C. It teaches us about new invention and technology.

Explanation:

Science fiction is a genre of fiction in which stories often tell about the science and technology of the future.

Science fiction also uses the principles of science. These stories are partially true and partially fictitious.

They often tell us about new technology that will evolve.

5 0
3 years ago
If a sample of DNA contains 20% C nucleotides, what percent of G nucleotides would there be. Explain
Licemer1 [7]

Answer:

The perecentage of guanine is 30%

Explanation:

the DNA from any cell of all organisms should have a 1:1 ratio (base Pair Rule) of purine bases [for the DNA cytosine, thymine and for the RNA uracil] and pyrimidine bases [guanine and adenine for RNA and DNA]. The amount of guanine should be equaled to cytosine and the amount of adenine should be equaled to thymine. You can follow this rule in both strands of the DNA.

7 0
3 years ago
Read 2 more answers
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