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sladkih [1.3K]
3 years ago
5

Question down below thanks

Biology
1 answer:
lilavasa [31]3 years ago
3 0

Explanation:

X is the answer

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He tells his students that _____ in the ______ help coordinate contraction of certain muscles and relaxation of others. Answers:
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Answer:

A. motor neurons; peripheral nervous system

Explanation:

Motor neurons carry signals from the peripheral nervous system to the muscles. This causes the muscles to either relax or contract. Note that the peripheral nervous system consists of neurons and parts of neurons outside of the central nervous system which consists of the brain and spinal cord. When signals are transmitted between the motor neurons and peripheral nervous system, this causes a response to stimulus in the muscles which would either, relax or contract.

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3 years ago
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why does the meiosis produce cells with only half the amount of DNA? How does this aid in the formation of a healthy zygote?
Andreyy89
Meiosis produces cells (germ cells or gametes) with only half the DNA, or chromosomes, as normal cells (somatic cells). This is called haploid or referred to as "n" number of chromosomes. Normal body cells have doubke that, called "2n," or diploid. For humans our n = 23, so germ cells (haploid) have only 23 chromosomes, while somatic (normal body) cells have "2n" or 46 chromosomes. It is important to only carry half the number of chromosomes or DNA (n), because it is going to combine with another half (n) when sperm meets egg during fertilization. This n + n = 2n restores the diploid number of chromosomes (DNA) in a zygote, the first cell of a future embryo, fetus, and new human being.
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What effect would there be on the final daughter cell if the spindle fibers failed to pull a chromosome toward the pole, as in c
AleksAgata [21]

Answer and Explanation:

Nondisjunction occurs when homologous chromosomes fail to segregate during anaphase I or sister chromatids fail to segregate during anaphase II. The result is an addition or loss of one or more chromosomes. Nondisjunction is associated with disorders like Down's syndrome due to an extra chromosome, Klinefelter's syndrome or Turner's syndrome. These phenomenon where one has three members of homologous chromosome is called trisomy.

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Trisomy is a mutation that results in a cell having an extra
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Down syndrome is an example of a condition caused by trisomy<span>. People with Down syndrome typically have three copies of chromosome 21 in each </span>cell<span>, for a total of 47 chromosomes per </span>cell<span>. Monosomy, or the loss of one chromosome in </span>cells<span>, is another kind of aneuploidy</span>
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