Answer:
The correct answer would be non-disjunction.
Down syndrome refers to the genetic disease caused by the non-disjunction of chromosome number 21.
Non-disjunction refers to the event in which the homologous chromosomes or sister chromatids fail to separate properly during a cell division.
In Down syndrome, the sister chromatids of chromosome 21 fail to separate properly which results in the formation of a gamete with 2 copies of chromosome 21.
When this gamete fertilizes with another gamete, it results in the formation of a zygote with 47 chromosomes, that is, 46 chromosomes + extra copy of chromosome 21.
They are all living organisms
It could be c. But the answer is B
Answer:
This is called replication.Generally, in an experimental set up experimental findings needed to be repeated continuously until a reasonable similar conclusion is reached.
Scientists needed to carry out similar experimental findings to get a similar results, to arrive at a reasonable conclusion.
It is the stage that is important for them to check the results arrived at.Replication therefore helps to identify any variability in the experimental results,for accurate results.
Explanation:
