B13.10 Embryo Screening

Question 1

How many pairs of chromosomes are there in a human body ?

Answer 1

23 pairs 46 chromosomes
Down syndrome has 47 chromosomes

Question 2

Which pair of chromosomes determines what sex a person is?

Answer 2

Sex chromosomes

Question 3

What pair of sex chromosomes does a woman have?

Answer 3

XX

Question 4

How many chromosomes does a human egg or sperm cell contain ?

Answer 4

23 chromosomes

Question 5

What pair of chromosome does a man have ?

Answer 5

XY

Question 6

What are the pros and cons of embryo screening ?

Answer 6

Pros
- quality of life for potential children
- can screen for disordered
- eventually phasing out of disorders
Cons
- risky linked to miscarriages
- expensive procedure
- ethical argument- religious and moral
- lead to ‘designer babies’ with people choosing traits for their babies

Question 7

What are the two methods of embryonic screening ?

Answer 7

Placenta tissue samples

Amniotic fluid samples

Question 8

What are the two types of placenta tissue samples ?

Answer 8

Chorionic villus sampling
- ultrasound device and catheter

Chorionic villus sampling method two
- needle and ultrasound device

Question 9

When is chorionic villus used ?

Answer 9

In the earlier stages

Question 10

When is amniotic fluid samples used

Answer 10

In the later stages

Question 11

What is the name for taking amniotic fluid samples ?

Answer 11

Amniocentesis