Answer:
A. aneuploidy; trisomic
Explanation:
Aneuploidy means having more numbers of chromosomes than usual while polyploidy means having an abnormal number of chromosome sets. Down syndrome is a trisomy on chromosome 21 meaning there are 3 chromosomes for chromosome set 21.
I think the correct answer from the choices listed above is option C. <span>Enzymes are catalysts. This means that they are able to speed up chemical reactions. Also, they are not used up by reactions. They are not being consumed in the process. Hope this answers the question. </span>
The most true answer from these choices is:
Methyl groups most often added to guanine-cytosine base pairs because they are held by three hydrogen bonds, and this decreases the probability of gene expression.
it's b. anaphase and spindle fibres pulls chromosomes towards the centrioles in this phase.
C.
It is hard for soil to become fertile when it can not get water from the rain, and high temperatures would cause any water the soil does get to evaporate.
