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kvasek [131]
3 years ago
8

12.

Biology
1 answer:
r-ruslan [8.4K]3 years ago
8 0

Answer:

d

Explanation:

The tetrad is formed by synapsis of homologous chromosomes.

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An international research effort called the Human Genome Project, which worked to determine the sequence of the human genome and identify the genes that it contains, estimated that humans have between 20,000 and 25,000 genes. Every person has two copies of each gene, one inherited from each parent.

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Explain why the resistance of the current path through the extracellular fluid is much smaller than the resistance of the curren
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The correct answer is - the large cross-sectional area and greater length of the cytoplasmic core get less resistance than the smaller cross-sectional area.

Explanation:

The greater length and the large cross-sectional area of the cytoplasmic path or core get less resistance than the resistance of the current path which is the small cross-sectional area of axoplasm. This leads it to greater resistance than the resistance of the current path through the extracellular fluid.

Other than this there is also an unequal distribution of the ions that leads to the increase in potential difference as higher Na+ ions present in cytoplasm and high amount of K+ ion present in axoplasm.

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