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Inessa05 [86]
3 years ago
15

Down syndrome is a condition in which the individual

Biology
1 answer:
djverab [1.8K]3 years ago
4 0
Has one extra chromosome in each cell (i.e 47 instead of 4.6). This is caused by one of the cell divisions during the formation of sex cells. Basically, the 21st chromosome ends up with 3 chromatids instead of 2. This is also why down syndrome is called trisomy 21.
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The third and last option is correct.


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Hope it helped,


Happy homework/ study/ exam!

5 0
3 years ago
Which two of these characteristics does an organism with bilateral symmetry possess?
Oksanka [162]
<span>Choices (b) and (c) are the most correct. Bilateral symmetry requires a central axis for there to be two halves. In addition, this type of symmetry requires a head, which will encounter the environment before any other part of the body and move in the direction of travel. Most animals exhibit this characteristic.</span>
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Nutka1998 [239]

Answer:

The correct answer is inheritance.

Explanation:

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     Genetic characteristics are stored within the sex chromosome of both male(XY) and female(XX).During fertilization when the sperm cells fuses with ovum at that time some characteristics of both male and female gets incorporated into the diploid zygote which give rise to the new organism containing inherited genetic characteristics.

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4 0
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