Species
New species can be formed through the process of natural selection and evolution. A species is defined as organisms that can interbreed and form fertile offspring.

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Key terms in this lesson
- Mutation
- A change in the base sequence of DNA.
- Gene flow
- The transfer of alleles between populations, caused by the migration of individuals or gametes.
More in Genetics and Variation
- Epistasis
- The Hardy-Weinberg Principle
- Changes in Allele Frequencies
- Population Bottlenecks and The Founder Effect
- Types of Selection
- Allopatric Speciation
- Sympatric Speciation
- Artificial Selection
All 36 lessons in Genetics and Variation · All OCR A-level Biology topics