GCSE Biology – Polydactyly and cystic fibrosis

Last updated: 30/04/2020

AQA GCSE Science – Biology higher Inheritance, variation and evolution GCSE Biology – Polydactyly and cystic fibrosis

Learning Objectives

-I can describe the phenotype and genotype of a person with polydactyly
-I can describe the phenotype and genotype of a person with cystic fibrosis

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Question 1 of 26

1. Question
What does recessive allele mean?
- The allele is only expressed if two copies are present
- The allele is always expressed
- The allele is only expressed if 1 copy is present
- The allele is never expressed
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Question 2 of 26

2. Question
What does dominant allele mean?
- The allele is always expressed
- The allele is only expressed if two copies are present
- The allele is never expressed
- The allele is only expressed if only 1 copy is present
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Question 3 of 26

3. Question
Which gene pair represents a child being heterozygous?
- Dd
- dd
- DD
- dM
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Question 4 of 26

4. Question
What does a carrier mean?
- Someone carries the recessive allele for a disease but does not have the disease
- Someone carries the recessive allele for a disease and has the disease
- Someone has a disease
- Someone does not have any genetic link to a disease
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Question 5 of 26

5. Question
What type of condition is polydactyly?
- An inherited condition
- A communicable condition
- An infectious disease
- A safe condition
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Question 6 of 26

6. Question
What does polydactyly cause?
- The person to have extra digits
- The person to have not enough digits
- The person to have small digits
- The person to have large digits
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Question 7 of 26

7. Question
What must the parents have for a child to have polydactyly?
- One parent must have the disease
- Both parents must have the disease
- One parent must carry the disease
- No parents must have the disease
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Question 8 of 26

8. Question
What type of allele causes polydactyly?
- A dominant allele
- A recessive allele
- A dominant and recessive allele
- No alleles cause polydactyly
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Question 9 of 26

9. Question
Which gene pair represents a child not having polydactyly?
- dd
- DD
- Dd
- dD
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Question 10 of 26

10. Question
Does a heterozygous child for the polydactyly gene have polydactyly?
- Yes
- We cannot tell
- No – if the D is from the father
- No – if the D is from the mother
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Question 11 of 26

11. Question
If both parents are Dd for polydactyly, what is the chance of the child having polydactyly?
- 3 out of 4
- 1 out of 4
- 1 out of 1
- 1 out of 3
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Question 12 of 26

12. Question
If one parent is DD for polydactyly and the other is dd, what is the chance of the child having polydactyly?
- 1 out of 1
- 1 out of 4
- 1 out of 3
- 1 out of 2
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Question 13 of 26

13. Question
If one parent is Dd for polydactyly and the other is dd, what is the chance of the child having polydactyly?
- 1 out of 2
- 1 out of 4
- 1 out of 3
- 1 out of 1
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Question 14 of 26

14. Question
What type of condition is cystic fibrosis?
- An inherited condition
- A communicable condition
- An infectious disease
- A safe condition
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Question 15 of 26

15. Question
What does cystic fibrosis affect?
- The lungs and pancreas
- Just the lungs
- Just the pancreas
- The ribosomes
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Question 16 of 26

16. Question
What does cystic fibrosis cause?
- The production of thick, sticky mucus
- An increase in respiration
- A decrease in photosynthesis
- A change in homeostasis
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Question 17 of 26

17. Question
What can cystic fibrosis cause?
- Respiratory issues
- Heart rate issues
- Issues with heart disease
- Issues with strokes and TIAs
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Question 18 of 26

18. Question
What is cystic fibrosis caused by?
- A recessive allele
- A dominant allele
- Heterozygous alleles
- Homozygous alleles
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Question 19 of 26

19. Question
Why can offspring have cystic fibrosis without the parents having it?
- As both parents can still carry the gene
- As the offspring can produce the gene
- As the father can still have 2 C.F. genes
- As the mother can still have 2 C.F. genes
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Question 20 of 26

20. Question
Why can parents carry the cystic fibrosis allele without having cystic fibrosis?
- As the allele is recessive
- As the allele is dominant
- As the allele can be recessive or dominant
- As the allele is heterozygous
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Question 21 of 26

21. Question
How many parents must have the cystic fibrosis allele for the offspring to have it?
- 2
- 1
- 0
- 3
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Question 22 of 26

22. Question
Do both parents need to have cystic fibrosis for the child to have it?
- No – neither parent must have it
- No – only the father must have it
- No – only the mother must have it
- Yes
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Question 23 of 26

23. Question
Why must both parents have the cystic fibrosis allele for the child to have it?
- As the child must be homozygous recessive to show cystic fibrosis
- As the child must be heterozygous to show cystic fibrosis
- As the child must be homozygous dominant to show cystic fibrosis
- As the child is very prone to cystic fibrosis
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Question 24 of 26

24. Question
If both parents are carriers, what is the chance of the child having cystic fibrosis?
- 1 out of 4
- 1 out of 3
- 1 out of 2
- 1 out of 1
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Question 25 of 26

25. Question
If one parent is a carrier and the other has cystic fibrosis, what is the chance of the child having cystic fibrosis?
- 1 out of 2
- 1 out of 4
- 1 out of 3
- 1 out of 1
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Question 26 of 26

26. Question
If one parent has cystic fibrosis and the other has no cystic fibrosis allele, what is the chance of the child having cystic fibrosis?
- 0
- 1 out of 2
- 1 out of 3
- 1 out of 4
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