Unit 2 - Postnatal Screening

Question 1

What does antenatal screening identify?

Answer 1

The risk of a fetus inheriting a genetic disorder.

Question 2

When are ultrasounds aloud to be carried out?

Answer 2

Between 8-14 weeks

Question 3

What do ultrasounds/ dating scans show?

Answer 3

How far along the pregnancy is and the development of the baby

Question 4

Biochemical test on a woman include

Answer 4

Checking HCG levels

Blood pressure

Blood type

Urine tests

Question 5

A false positive result means

Answer 5

The test shows the fetus has a condition when it actually doesn’t

Question 6

A false negative result means

Answer 6

It shows the fetus doesn’t have the condition but actually does

Question 7

What Is The difference between a screening test and a diagnostic test

Answer 7

A screening test detects signs and symptoms of a condition

A diagnostic test shows a definite answer to whether or not a person has a specific condition

Question 8

What is a person karotype?

Answer 8

A visual display of their complete chromosome complement

Question 9

What Is Amniocentesis and when can it be carried out?

Answer 9

A diagnostic test to allow a Karyotype to be prepared.

This can be carried out about 14 to 16 weeks.

Question 10

What is CVS and when can it be carried out?

Answer 10

Another diagnostic test taken to allow a persons kayrotype to be prepared.
This can be carried out at 8 weeks.

Question 11

Amniocentesis allows for what to be detected?

Answer 11

Chromosomal abnormalities

Question 12

What are the dangers of CVS

Answer 12

This sampling causes a higher chance of miscarriage

Question 13

What are autosomes?

Answer 13

Chromosomes that aren’t involved in determine the sex of the individual

Question 14

What are the four main patterns of inheritance?

Answer 14

Autosomal recessive
Autosomal dominant
Autosomal incomplete dominance
Sex linked recessive

Question 15

How can a geneticist recognise an autosomal recessive trait?

Answer 15

The trait is shown rarely

The trait could skip a generation

It is equally spread between males and females

Question 16

How can a geneticist recognise an autosomal dominant trait ?

Answer 16

The trait appears in every generation

Each sufferer has an affected parent

The trait is spread equally between males and females

Question 17

How can a pattern of inheritance be shown?

Answer 17

By collecting information about a particular characteristic from family members and then creating a pedigree chart

Question 18

How a geneticist can recognise autosomal incomplete dominance

Answer 18

The full disorder occurs rarely

Part of the disorder occurs more often

Each sufferer fully expressed to the disorder has both parents with the partially expressed form

Males and females are affected equally

Question 19

How can a geneticist recognise a sex linked disorder

Answer 19

Males are more affected than females

None of the sons are affected by the affected father