Question 1
3 out of 3 points
Which of the following is true about karyotypes?
Selected
Answers: Is an image showing all the chromosomes from a single cell of one
individual
Shows stained chromosomes which can be arranged in pairs
Is often used to detect chromosome number abnormalities
In humans is composed of 46 chromosomes under typical conditions
Question 2
3 out of 3 points
In order to work with DNA in the lab to look at it sequence a lot of DNA is typically needed
since it is so small. Many copies of DNA are made using a process called;
Selected Answer: PCR
Question 3
3 out of 3 points
PCR has been used to amplify the DNA from a 7000 year old mummy.
Selected Answer: True
Question 4
3 out of 3 points
About 30% of chromatin is histone.
Selected Answer: True
Question 5
3 out of 3 points
Meiosis in the female gametes which results in an oocyte is called oogenesis.
Selected Answer: True
Question 6
3 out of 3 points
DNA replication is a complex process involving many proteins including a protein which
unwinds DNA called helicase.
Selected Answer: True
Question 7
3 out of 3 points
Klinefelter’s syndrome is characterized at the chromosome level as XYY.
Selected Answer: False
Question 8
3 out of 3 points
There are two ways that chromosomes can be arranged to produce Trisomy 21.
Selected Answer: True
Question 9
3 out of 3 points
Trisomy 13 children tend to have more severe health abnormalities than children with trisomy
21.
Selected Answer: True
Question 10
3 out of 3 points
Which of the following is true about Trisomy 21?
Selected Answers: Many trisomy children are aborted before birth
Is also known as Down’s syndrome after its discoverer
Many individuals with Down syndrome lead joyful and productive lives
Question 11
3 out of 3 points
Telomeres are found on the end of chromosomes.
Selected Answer: True
Question 12
3 out of 3 points
Centromeres which are typically found in the center of the chromosomes can sometimes be
found on the end of chromosomes.
Selected Answer: True
Question 13
3 out of 3 points
Polyploid cells have extra chromosome sets.
Selected Answer: True
Question 14
3 out of 3 points
Meiosis II is also called equational division.
Selected Answer: True
Question 15
3 out of 3 points
DNA is highly condensed and compacted to fit into the cell nucleus. During its condensation
process it first wraps around a highly conserved protein called:
Selected Answer: Histone
Question 16
3 out of 3 points
At the conclusion of meiosis I the two cells produced are;
Selected Answer: haploid
Question 17
3 out of 3 points
The single building block unit of DNA is the nucleotide.
Selected Answer: True
Question 18
3 out of 3 points
This scientist showed in 1928 that there was a transforming principle in cells:
Selected Answer: Griffeth
Question 19
3 out of 3 points
Modern genetics and medicine have shown that many types of chromosome abnormalities
can occur in the unborn before birth, however because most of these children do not survive
in the womb less than 1% of all newborns have chromosomal abnormalities which produce
symptoms.
Selected Answer: True
Question 20
3 out of 3 points
Trisomies are less harmful than monosomies.
Selected Answer: True
Question 21
3 out of 3 points
Homologous pairs of chromosomes line up at the beginning of meiosis I and meiosis II.
Selected Answer: False
Question 22
3 out of 3 points
The sugar part of the DNA which makes up the sugar-phosphate backbone is ribose ( or more
formally known as deoxyribose).
Selected Answer: True
Question 23
3 out of 3 points
This scientist was important in that she obtained an x-ray photo of DNA which helped
determine its structure:
Selected Answer: Franklin
Question 24
3 out of 3 points
Maternal serum markers and ultrasound findings are used to screen for elevated risk of
trisomy in a fetus.
Selected Answer: True
Question 25
3 out of 3 points
Which one of the following trisomy conditions has a 85% survival rate at one year after
birth?
Selected Answer: Trisomy 21
