Chorionic villus sampling (CVS) is a technique which can be used during antenatal screening - Scottish Highers Human Biology - Question 6 - 2015
Question 6
Chorionic villus sampling (CVS) is a technique which can be used during antenatal screening. The cells obtained from CVS are used to prepare a karyotype.
(a) The di... show full transcript
Worked Solution & Example Answer:Chorionic villus sampling (CVS) is a technique which can be used during antenatal screening - Scottish Highers Human Biology - Question 6 - 2015
Step 1
Place a cross (X) on the diagram of the enlarged section of placenta to indicate the area from which cells are removed during CVS.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The cross (X) should be placed in the center of the 'fetal tissue' area of the enlarged section of the placenta.
Step 2
Describe the process by which a karyotype is produced from cells removed during CVS.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Cells obtained from the CVS procedure are first cultured, allowing them to divide sufficiently to obtain enough cells. Subsequently, these cells are treated to stop cell division at the metaphase stage, and then the chromosomes are stained and photographed to produce a karyotype.
Step 3
Suggest an advantage of using CVS rather than amniocentesis during antenatal screening.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
CVS can be performed earlier in pregnancy compared to amniocentesis, providing earlier diagnosis of genetic conditions.
Step 4
Name the type of antenatal screening tests which are routinely carried out to monitor the concentration of certain substances, such as protein, in a pregnant woman’s blood.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Biochemical tests.
Join the Scottish Highers students using SimpleStudy...
