29. Trisomy 21 means that a person has ____. two copies of chromosome 2 and one
ID: 148118 • Letter: 2
Question
29.
Trisomy 21 means that a person has ____.
two copies of chromosome 2 and one copy of chromosome 1
Two copies of chromosome 2 and one copy of chromosome 1
Three copies of chromosome 21
is missing one copy of chromosome 21
30.
The risk of having a child with down syndrome is highest in _______.
Men who have children before they are 18.
Woman who are having a second child before they are 30.
Woman over the age of 35.
Woman under the age of 18
31.
Which of the following refers to the attachment of one piece of chromosome to another piece of chromosome?
Inversion
Deletion
Translocation
Duplication
32.
Who first discovered the laws of genetics?
Pearson
Morgan
Mendel
Watson
two copies of chromosome 2 and one copy of chromosome 1
Two copies of chromosome 2 and one copy of chromosome 1
Three copies of chromosome 21
is missing one copy of chromosome 21
30.
The risk of having a child with down syndrome is highest in _______.
Men who have children before they are 18.
Woman who are having a second child before they are 30.
Woman over the age of 35.
Woman under the age of 18
31.
Which of the following refers to the attachment of one piece of chromosome to another piece of chromosome?
Inversion
Deletion
Translocation
Duplication
32.
Who first discovered the laws of genetics?
Pearson
Morgan
Mendel
Watson
Explanation / Answer
29. Trisomy ia an aneuploidy in which there is an addition or gain of one same chromosome but not a complete set, that is 2n+1. so trisomy 21 means three copies of chromosome 21.
30. A woman`s chance of giving birth to a downs syndome child increases from 0.1% (when the mother is less than 20 years of age) to 3% (when the mother is above 45 years of age). this is because older egg is having higher chances of improper chromosome division.
31. Translocation results when two non-homologous chromosome exchanges their parts.
32. Mendel was the first who discovered laws of genetics.
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