GCSE Biology – Sex-linked genetic diseases

Last updated: 26/05/2020
Edexcel GCSE Science – Biology higher Genetics GCSE Biology – Sex-linked genetic diseases

Learning Objectives

-I can describe the inheritance of sex-linked genetic diseases

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  3. Answered

  1. What is a recessive allele?

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  2. What is a dominant allele?

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  3. How are recessive alleles written?

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  4. How are dominant alleles written?

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  5. Why are some alleles written as lower case and some as capitals?

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  6. When will a recessive allele not remain dormant?

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  7. What happens when a person receives one recessive allele?

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  8. What are genetic conditions called?

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  9. What are people called who inherit genetic conditions?

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  10. What are people called who do not have symptoms of the disorder but can pass the disorder onto their children?

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  11. How many recessive alleles do most genetic disorders require?

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  12. How many recessive alleles does cystic fibrosis require?

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  13. What happens when a person receives one recessive allele?

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  14. Where will the conditions caused by a recessive allele be inherited from?

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  15. Where are the two recessive alleles inherited from when a sufferer inherits a genetic disorder?

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  16. What type of disorders occur when alleles appear on the sex chromosomes?

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  17. Why are the different sex-chromosomes labelled?

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  18. What type of chromosome do men have?

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  19. What type of chromosome do women have?

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  20. Which type of chromosome contains more genes?

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  21. Which type of chromosome contains more genes?

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  22. Which type of chromosome is smaller?

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  23. Which type of chromosome is smaller?

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  24. What diagram helps when predicting the outcome of genetic diseases based on sex chromosomes?

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  25. Describe the red-green colour blindness disorder.

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