Lesson 2.5.3
2.5.3 Uses of genetic screening and prenatal testing Quiz: Pearson Edexcel Biology, Unit 2
20 questions
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Lesson 2.5.3, Uses of genetic screening and prenatal testing: 20 multiple choice questions for the Pearson Edexcel Biology (9BI0), Unit 2: Genes and Health, written with Revision Ninja.
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The 20 questions
-
What is the main purpose of genetic carrier screening?
- Detect current symptoms
- Determine fetal sex
- Identify recessive alleles
- Treat genetic conditions
-
What are embryos tested for during pre-implantation genetic diagnosis?
- Uterine abnormalities
- Bacterial infections
- Maternal blood type
- Genetic conditions
-
Which fluid is extracted during amniocentesis for genetic testing?
- Chorionic fluid
- Amniotic fluid
- Maternal blood
- Follicular fluid
-
Which tissue is sampled during chorionic villus sampling?
- Umbilical cord
- Uterine wall
- Amnion
- Placenta
-
Which invasive prenatal test is carried out earlier in pregnancy?
- Heel prick test
- Amniocentesis
- Chorionic villus sampling
- Pre-implantation diagnosis
-
What main risk is associated with both amniocentesis and chorionic villus sampling?
- Multiple pregnancy
- Ectopic pregnancy
- Infertility
- Miscarriage
-
Which embryos are selected for implantation following pre-implantation genetic diagnosis?
- Homozygous recessive embryos
- Carrier embryos only
- All viable embryos
- Unaffected embryos
-
Two carrier parents each produce three embryos by IVF. If each embryo independently has a 1/4 chance of being affected, what is the probability that none of the three embryos is affected?
- 1/4
- 27/64
- 1/64
- 9/64
-
Why is prenatal testing offered to couples who are both heterozygous carriers?
- Test fetal genotype
- Cure the fetus
- Prevent pregnancy
- Determine parental health
-
What main option does a positive prenatal diagnostic test present to parents?
- Gene therapy
- Immediate fetal cure
- Pregnancy termination
- Automatic IVF
-
What is the expected outcome for a fetus homozygous recessive for cystic fibrosis?
- Unaffected non-carrier
- Developing cystic fibrosis
- Asymptomatic carrier
- Immunity to infection
-
Two carrier parents have two children. What is the probability that at least one child is affected by a recessive condition?
- 7/16
- 1/4
- 9/16
- 1/16
-
Which test is used for newborn screening of genetic conditions in the UK?
- Blood spot test
- Karyotype array
- Chorionic villus sampling
- Amniocentesis
-
Why do amniocentesis results take up to three weeks to become available?
- Enzyme activation needed
- Protein digestion needed
- Cell culture needed
- Blood centrifuging needed
-
What is a major disadvantage of pre-implantation genetic diagnosis compared to prenatal testing?
- Later testing stage
- Requires IVF
- Inaccurate results
- Higher miscarriage risk
-
What information is provided by a karyotype analysis?
- DNA base sequence
- Gene mutation locations
- Protein structure
- Chromosome number
-
What is an advantage of chorionic villus sampling compared to amniocentesis?
- Lower miscarriage risk
- Earlier test timing
- Non-invasive procedure
- 100% test accuracy
-
In a population where q = 0.05 for a recessive allele, what percentage of people are carriers, approximately?
- 9.5%
- 5%
- 0.25%
- 95%
-
Why is a single cell removed from an embryo during pre-implantation genetic diagnosis?
- To check size
- For sex selection
- To induce twinning
- For DNA analysis
-
Sharing genetic screening results without permission breaches which ethical principle?
- Confidentiality
- Non-maleficence
- Utilitarianism
- Beneficence
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