AQA
GCSE
COMBINED SCIENCE: TRILOGY
Higher Tier Biology Paper 2H
June 2023
, 2
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IB/M/Jun23/8464/B/2H
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0 1 Sexual reproduction in humans involves the production of egg cells and sperm cells. box
0 1 . 1 Name the type of cell division that produces egg cells and sperm cells.
[1 mark]
0 1 . 2 Sexual reproduction produces offspring that are genetically different from each other.
Give two reasons why sexual reproduction causes variation in the offspring.
[2 marks]
1
2
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Polydactyly is an inherited disorder. box
The allele for polydactyly is dominant, D.
A person with two copies of the allele d will not have polydactyly.
0 1 . 3 A person with the genotype DD is homozygous.
What word describes the genotype Dd?
[1 mark]
0 1 . 4 A person with the genotype Dd and a person with the genotype dd plan to have
a child.
Determine the probability that the child will have polydactyly.
You should:
complete the Punnett square diagram
identify any offspring genotype that would have polydactyly.
[5 marks]
Probability that the child will have polydactyly =
IB/M/Jun23/8464/B/2H
GCSE
COMBINED SCIENCE: TRILOGY
Higher Tier Biology Paper 2H
June 2023
, 2
Do not write
outside the
There are no questions printed on this page box
DO NOT WRITE ON THIS PAGE
ANSWER IN THE SPACES PROVIDED
IB/M/Jun23/8464/B/2H
, 3
Do not write
outside the
0 1 Sexual reproduction in humans involves the production of egg cells and sperm cells. box
0 1 . 1 Name the type of cell division that produces egg cells and sperm cells.
[1 mark]
0 1 . 2 Sexual reproduction produces offspring that are genetically different from each other.
Give two reasons why sexual reproduction causes variation in the offspring.
[2 marks]
1
2
Question 1 continues on the next page
Turn over ►
IB/M/Jun23/8464/B/2H
, 4
Do not write
outside the
Polydactyly is an inherited disorder. box
The allele for polydactyly is dominant, D.
A person with two copies of the allele d will not have polydactyly.
0 1 . 3 A person with the genotype DD is homozygous.
What word describes the genotype Dd?
[1 mark]
0 1 . 4 A person with the genotype Dd and a person with the genotype dd plan to have
a child.
Determine the probability that the child will have polydactyly.
You should:
complete the Punnett square diagram
identify any offspring genotype that would have polydactyly.
[5 marks]
Probability that the child will have polydactyly =
IB/M/Jun23/8464/B/2H
