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gregori [183]
3 years ago
8

Which of the following is NOT a source of genetic variation?

Biology
1 answer:
nikklg [1K]3 years ago
4 0

Answer:

The correct answer is option d) age of either or both parents.

Explanation:

Genetic variation is the difference in nucleotide sequences between individuals organisms within a particular population. Variation can occur either in germ cells that are sperm and egg or in somatic cells or in both.

Random fertilization of egg and sperm can lead to genetic variation is every germ cell has a different set of chromosomes. Independent assortment of chromosomes is also the same as random fertilization as it is also random. Crossing over of homologous chromosomes is one of a major source of the genetic variation as it forms a new set of chromosomes.

Thus, the correct answer is option D) age of either or both parents.

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cupoosta [38]

Answer: A and C are the correct answers

Explanation:

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3 years ago
Explain what happens in the nervous system when your finger is hurt
vladimir2022 [97]

Tissue damage activates nociceptors or pain receptors in the skin. A signal is sent to the peripheral nerve to the spinal cord where neurotransmitters or chemical messengers are released. It activates other nerves to pass signal to the brain. The signals are relayed to the somatosensory cortex for sensation, frontal cortex for thinking and limbic system for emotional response.

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Early coal miners used canaries in cages as an early warning system to detect dangerous air
blagie [28]

Answer:

Because the Arctic glacier is crucial in cooling the land.

Explanation:

The glaciers contained in the Arctic are essential for cooling the earth's climate, which is why Arctic conditions are so important in determining the earth's climate changes.

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3 years ago
COMMON TOPICAL MEDS<br> What are the effects of oral drug administration
ddd [48]

Answer:

Dry Mouth (Xerostomia)

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4 0
3 years ago
What is the best example of how the nervous system maintains homeostasis?
Blizzard [7]
I'm not sure if it's the "best" example but.

If your blood tempature is low, the hypothalamus will issues reflex commands that make your body shiver. If you are hot, you will sweat is the opposite of this.

Another example is, if your blood contains pyrokines then you might have an infection so you begin to run a fever as your body's way to kill the pathogen at the direction of the hypothalamus.

Hope these examples help!
5 0
3 years ago
Read 2 more answers
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