Inheritance, Variation and Evolution Exam Questions
Questions covering DNA structure, the genome, genetic inheritance, sex determination, variation, evolution, natural selection, selective breeding, genetic engineering, and classification. Download free past paper questions organised by topic with mark schemes.
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Frequently Asked Questions
How do you draw a Punnett square for GCSE Biology?
Draw a 2x2 grid. Put one parent's alleles along the top and one down the side. Fill in the squares by combining alleles. This shows possible offspring genotypes and lets you calculate probability ratios.
What is the difference between genotype and phenotype?
Genotype is the genetic makeup (the alleles an organism has, e.g., Bb). Phenotype is the physical characteristic that is expressed (e.g., brown eyes).
What is natural selection GCSE Biology?
Natural selection: 1) Variation exists in a population, 2) Individuals with advantageous traits survive better, 3) They reproduce and pass on their genes, 4) Over time, the advantageous trait becomes more common.
Is genetic engineering Triple Science only?
Yes, genetic engineering in detail is Triple Science only. Combined Science students only need basic knowledge of selective breeding.
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