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masha68 [24]
3 years ago
7

Which type of chromosomal mutation causes this form of Down syndrome?

Biology
2 answers:
Setler79 [48]3 years ago
8 0
Trisomy 21 (nondisjunction) Down syndrome is usually caused by an error in cell division called "nondisjunction." Nondisjunction results in an embryo with three copies of chromosome 21 instead of the usual two. Prior to or at conception, a pair of 21st chromosomes in either the sperm or the egg fails to separate.
AVprozaik [17]3 years ago
4 0
Nondisjunction is the chromosomal mutation 
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Which phrases describe air pressure? Select three options.
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  • decreases as altitude increases
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Pressure is the force exerted, by a substance, per unit area.

Explanation:

Pressure is given by the formulae;

P = F/ A

Whereby;

P = pressure

F = Force

A = area

Remember that ..

F = Ma

Whereby;

F = Force

M = mass

a = acceleration

Therefore pressure can be given as;

P = Ma / A

The mass of the above column of a substance multiplied by the acceleration due to gravity = pressure exerted by the substance.

Learn More:

For more on pressure check out;

brainly.com/question/13363709

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Which of the following is an example of an igneous rock?
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Granite is an example
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Someone please help. And for the 3rd one it’s the same answer choices as the others
Lunna [17]
Do you still need help on this ???
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DNA is made up of monomers called nucleotides. How many does mono- represent?
Lunna [17]

Answer:

It is often said that life is “carbon-based.” This means that carbon atoms, bonded to other carbon atoms or other elements, form the fundamental components of many, if not most, of the molecules found uniquely in living things. Other elements play important roles in biological molecules, but carbon certainly qualifies as the “foundation” element for molecules in living things. It is the bonding properties of carbon atoms that are responsible for its important role.

Carbon Bonding

Explanation:

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What movements are involved in the relationship between the Earth and Sun?​
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The earth goes in a circular pattern around the sun

Explanation:

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