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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Question 1 of 25

1. Question
What is a recessive allele?
- A type of gene that is supressed in the presence of a dominant allele
- A type of gene that will always express itself
- A type of gene that is not supressed in the presence of a dominant allele
- A type of gene that is invisible
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Question 2 of 25

2. Question
What is a dominant allele?
- A type of gene that will always express itself
- A type of gene that is supressed in the presence of a recessive allele
- A strong gene
- A type of gene that is invisible
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Question 3 of 25

3. Question
How are recessive alleles written?
- Lower case
- Capital
- Right
- Left
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Question 4 of 25

4. Question
How are dominant alleles written?
- Capital
- Lower case
- Right
- Left
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Question 5 of 25

5. Question
Why are some alleles written as lower case and some as capitals?
- To differ recessive and dominate alleles
- To differ sex chromosomes
- To differ male and female
- No reason
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Question 6 of 25

6. Question
When will a recessive allele not remain dormant?
- When paired with another recessive allele
- When paired with a dominant allele
- When it is left unpaired
- It will not
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Question 7 of 25

7. Question
What happens when a person receives one recessive allele?
- They can pass on the disorder to their children without showing the symptoms
- They cannot pass on the disorder to their children with showing the symptoms
- They can pass on the disorder to their children with showing the symptoms
- They cannot pass on the disorder to their children without showing the symptoms
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Question 8 of 25

8. Question
What are genetic conditions called?
- Disorders
- Viral infections
- Disability
- Any of these
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Question 9 of 25

9. Question
What are people called who inherit genetic conditions?
- Sufferers
- Carriers
- Heriters
- Relations
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Question 10 of 25

10. Question
What are people called who do not have symptoms of the disorder but can pass the disorder onto their children?
- Carriers
- WRONG ANSWER
- WRONG ANSWER
- WRONG ANSWER
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Question 11 of 25

11. Question
How many recessive alleles do most genetic disorders require?
- 2
- 3
- 4
- 1
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Question 12 of 25

12. Question
How many recessive alleles does cystic fibrosis require?
- 2
- 3
- 4
- 1
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Question 13 of 25

13. Question
What happens when a person receives one recessive allele?
- They do not have the disorder
- Sufferers
- Heriters
- Relations
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Question 14 of 25

14. Question
Where will the conditions caused by a recessive allele be inherited from?
- Father
- Neither mother or father
- Mother
- Both mother and father
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Question 15 of 25

15. Question
Where are the two recessive alleles inherited from when a sufferer inherits a genetic disorder?
- Both mother and father
- Neither mother or father
- Mother
- Father
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Question 16 of 25

16. Question
What type of disorders occur when alleles appear on the sex chromosomes?
- Sex-linked
- Gamete-linked
- Female-linked
- Male-linked
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Question 17 of 25

17. Question
Why are the different sex-chromosomes labelled?
- To help predict genetic disorders
- To organise
- To help breed
- No reason
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Question 18 of 25

18. Question
What type of chromosome do men have?
- X
- Y
- Z
- K
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Question 19 of 25

19. Question
What type of chromosome do women have?
- Y
- X
- Z
- K
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Question 20 of 25

20. Question
Which type of chromosome contains more genes?
- Father
- Neither mother or father
- Mother
- Both mother and father
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Question 21 of 25

21. Question
Which type of chromosome contains more genes?
- Male
- Female
- Both male and female
- Neither male or female
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Question 22 of 25

22. Question
Which type of chromosome is smaller?
- Mother
- Neither mother or father
- Father
- Both mother and father
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Question 23 of 25

23. Question
Which type of chromosome is smaller?
- Female
- Male
- Both male and female
- Neither male or female
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Question 24 of 25

24. Question
What diagram helps when predicting the outcome of genetic diseases based on sex chromosomes?
- Genetic crosses
- Force diagram
- Allele grids
- Genetic columns
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Question 25 of 25

25. Question
Describe the red-green colour blindness disorder.
- When a person cannot tell the difference between red and green
- When a person can see red and green
- When a person cannot tell the difference between red and blue
- When a person cannot see red and green
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