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Course: Edexcel A Level Biology A (SNAB) 9BI0
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Edexcel A Level Biology A (SNAB) 9BI0

Topic 1 · Lifestyle, Health and Risk

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Topic 2 · Genes and Health

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Topic 3 · Voice of the Genome

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Topic 4 · Biodiversity and Natural Resources

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Topic 5 · On the Wild Side

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Topic 6 · Immunity, Infection and Forensics

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Topic 7 · Run for your Life

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Topic 8 · Grey Matter

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Quiz

19.2.2 Genetic Screening – Exam questions

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  • Questions count: 4
  • Passing grade: B+
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1.
Premarital screening in Saudi Arabia tests for certain recessive genetic disorders. Why is the risk of these disorders higher in marriages between relatives?
Because consanguineous marriage increases the chromosome number of the children
Because recessive alleles become dominant in consanguineous marriages
Because a carrier (Aa) shows symptoms and passes them on directly
Because the spouses are more likely to carry the same recessive allele (Aa), so it can appear in the children as two copies
2.
Which statement best describes Genetic screening?
Which statement best describes Genetic screening?
X-linked recessive; blood does not clot.
Dominant; nervous system degeneration.
Disease caused by an abnormal gene or chromosome.
Testing for disease alleles.
3.

Genetic screening is

treating a disease with genes
cloning embryos
vaccinating against a disease
testing DNA for the presence of particular alleles
4.

An ethical concern about genetic screening of embryos is

that it cures all diseases
the possibility of selecting embryos for non-medical characteristics
that it is always inaccurate
that it increases mutation
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Part of Topic 2 · Genes and Health — see every lesson and quiz in this unit.
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