GROUP TOPIC: Tetrasomy 18p Syndrome

Question 1

A genetic condition involving four copies of a specific chromosome or chromosome segment.

Answer 1

Tetrasomy

Question 2

It is a rare genetic disorder caused by the presence of four copies of the short arm of chromosome 28 instead of the usual two.

Answer 2

Tetrasomy 18p syndrome

Question 3

Causes

________________ - it happens by chance when egg or sperm cells form

____________ - An extra part of the short arm (p arm) of chromosome 18 is created.

_________________- the person ends up with four copies of this part, instead of the usual two.

_____________- it isn’t usually passed down from parents; it occurs randomly.

Answer 3

Causes

Random mistake - it happens by chance when egg or sperm cells form

Extra piece of Chromosome 18 - An extra part of the short arm (p arm) of chromosome 18 is created.

Four copies- the person ends up with four copies of this part, instead of the usual two.

Not inherited- it isn’t usually passed down from parents; it occurs randomly.

Question 4

Done to remove amniotic fluid (which contains fetal cells) from the uterus for testing or treatment. These cells are then analyzed for genetic and chromosomal disorders.

Answer 4

Amniocentesis

Question 5

Involves taking a sample of the chorionic villi, which are tiny, finger-like projections found in the placenta. Since the placenta and fetus share the same genetic material.

Answer 5

Chorionic villus sampling (CVS)