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alisha [4.7K]
3 years ago
13

I need help ! i really don’t get it

Biology
1 answer:
Vaselesa [24]3 years ago
5 0

Answer:

The presence of an additional chromosome

Explanation:

Look at "pair" 21. See how there are THREE chromosomes instead of TWO? Normally, there would only be two chromosomes in each pair but this karyotype shows a trisomy (see def. below) of the 21st pair. This was caused by a nondisjunction mutation of the 21st pair. The is also the karyotype of a person with Down's Syndrome.

Definition of Trisomy:

A condition of the presence of three chromosomes in a pair instead of two. This normally causes developmental irregularity.

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Answer:

Electron microscope

Explanation:

Electron microscope uses a beam of electrons as energy source. Since the beam has an exceptionally short wavelength, it strikes most objects in its path and increases the resolution of the microscope significantly. Thus it has a higher magnification and resolution.

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If the ribosomes of a cell were destroyed, what effect would this most likely have on the cell?
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D) They can increase the reaction rate for a given reaction by a thousand-fold or more.

Explanation:

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