What is chorionic villus sampling?
Chorionic
villus sampling (CVS) is a prenatal test that detects chromosomal abnormalities
such as Down syndrome, as
well as a host of other genetic disorders. The doctor takes cells from tiny
fingerlike projections on the placenta called the chorionic villi and sends
them to a lab for genetic analysis.
The main
advantage of CVS over amniocentesis is that you can have it done earlier —
generally between 11 and 12 weeks of pregnancy, although some testing centers
will do it as late as 13 weeks, 6 days. (For an amnio, you'll have to wait
until you're at least 16 weeks pregnant.)
Women
who choose to have CVS or amniocentesis are primarily those at increased risk
for genetic and chromosomal problems, in part because these tests are invasive
and carry a small risk of miscarriage.
GROUP WORK
Situation
The participants now are discussing materials assigned to them in a
group work.
Margaretha: Girls … like we did before … let’s have a
review again by reading in turn … maybe
we can start with Eny … please.
Eny: Ok … some of the blood cells of the fetus usually
do get into the mother’s circulation where they have been known to survive for
decades … your turn Laura …
Laura: This raises the possibility of
doing prenatal diagnosis of genetic disorder by sampling the mother’s blood
rather than having to rely on the more invasive procedures of amniocentesis and
chorionic villus sampling …
Margaretha: Yes …
that is called CVS … it’s now Zaenab please.
Zainab: The leakage of mother’s blood cells
into the fetus is far larger. However it does occur. A few pregnant women with
leukemia or lymphoma have transferred the malignancy to their fetus.
Margaretha: Yes …
some babies have also acquired melanoma from the transpalacenta passage of
these highly malignancy cells from their mother.
A.
Answer the question below!
1.
What
are the participants doing now?
2.
Who
is the first speaker to explain the material?
3.
What
is the Zainab’s explanation?
4.
What
is CVS?
5.
What
is the meaning f prenatal?
B.
Find the difficult word and translate it in Indonesia!
C.
Tenses: present perfect
Present perfect I gunakan untuk menyatakan Sesutu yang masih ada
dampaknya sampai sekarang.
Pola
S + Have/Has past participle (verb 3) + O/C
For example
She has eaten a cake
I have studied English
Make 5 another sentences of present perfect!
D.
From the dialog, find the present perfect sentence!
Tidak ada komentar:
Posting Komentar