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2024 AQA A-LEVEL BIOLOGY PAPER 2 LATEST EXAM ACTUAL QUESTIONS AND CORRECT VERIFIED ANSWERS|ALREADY GRADED A+ $17.99   Add to cart

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2024 AQA A-LEVEL BIOLOGY PAPER 2 LATEST EXAM ACTUAL QUESTIONS AND CORRECT VERIFIED ANSWERS|ALREADY GRADED A+

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2024 AQA A-LEVEL BIOLOGY PAPER 2 LATEST EXAM ACTUAL QUESTIONS AND CORRECT VERIFIED ANSWERS|ALREADY GRADED A+

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  • February 23, 2024
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2024 AQA A-LEVEL BIOLOGY PAPER 2 LATEST
EXAM 2024-2025 ACTUAL QUESTIONS AND
CORRECT VERIFIED ANSWERS|ALREADY GRADED
A+




Physical, behavioural, biochemical expression of an organisms
genotype
Phenotype




The type of genes an individual has
Genotype




Alles that is always expressed in the phenotype
Dominant


Alleles that are neither dominant nor recessive to one another, so
both alleles are always expressed in the phenotype.

,Codominant




The inheritance of a single gene
Monohybrid inheritance




Only expressed in the phenotype when homozygous
Recessive




both alleles are the same
Homozygous




Both alleles for a specific gene are different
Heterozygous

,Position of a gene on a chromosome
Loci




A set of instructions for a specific polypeptide
Gene




Different forms of a gene
Allele




1. Expected ratios are probability
2. Sexual reproduction is random due to random fusion of gametes
and random assortment homologous chromosomes.
3. Small sample size
4. Linked genes
Suggest four reasons why observed ratios are not the same as
expected ratios (4).

, 1. Homologous chromosomes pair up
2. Crossing over / chiasmata form;
3. Produces new combination of alleles
4. Chromosomes separate at random
5. This produces varying combinations of genes
6. Chromatids separated at meiosis II
Meiosis results in cells that have the haploid number of
chromosomes and show genetic variation. Explain how. (6)




1. Refer to the specific individuals (using their number)
2. Explain what happened with the genes (passed on
recessive/dominant)
3. Describe the genotype of your examples and mention their
phenotype (homozygous/heterozygous etc)
Pedigree Questions Mark Scheme (3)

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