PrepWisePrepWiseVariation
Inheritance & EvolutionStudy Notes

Sources of Genetic Variation

Part of Variation — GCSE Biology

This study notes covers Sources of Genetic Variation within Variation for GCSE Biology. Genetic and environmental variation in organisms It is section 2 of 10 in this topic. Use this study notes to connect the idea to the wider topic before moving on to questions and flashcards.

Topic position

Section 2 of 10

Practice

25 questions

Recall

20 flashcards

Sources of Genetic Variation

  • Mutations: Random changes in DNA sequence
  • Sexual reproduction: Mixing of alleles from two parents
  • Meiosis: Random assortment of chromosomes; crossing over

Keep building this topic

Read this section alongside the surrounding pages in Variation. That gives you the full topic sequence instead of a single isolated revision point.

Types of VariationVisual: VariationHow It Works: How Variation ArisesKey Definitions

Practice Questions for Variation

What is the main difference between genetic variation and environmental variation?

  • A. Genetic variation is caused by differences in DNA, environmental variation is caused by external factors
  • B. Genetic variation affects all organisms equally, environmental variation affects each organism differently
  • C. Genetic variation is reversible, environmental variation is permanent
  • D. Genetic variation only affects physical traits, environmental variation only affects behavioral traits
1 markfoundation

Explain how mutations contribute to genetic variation in populations.

4 marksstandard

Quick Recall Flashcards

Explain the role of mutations in genetic variation.
Mutations are random changes in DNA sequence that can result in genetic variation. They occur when there is an error during DNA replication or repair.
Give examples of discontinuous variation.
Examples include blood type and eye color, which have distinct categories rather than a continuous range.

Want to test your knowledge?

PrepWise has 25 exam-style questions and 20 flashcards for Variation — with adaptive difficulty and instant feedback.

Join Alpha

Previous

Types of Variation

Next

Visual: Variation