BRAINCAKEInheritance, variation and evolution
Revision notes for Inheritance, variation and evolution in AQA Combined Science: Trilogy (8464). Every lesson in BrainCake comes with R.E.C.I.P.E. recall steps, a quick check and spaced reviews.
- Sexual and asexual reproductionLiving things can reproduce in two ways.
- MeiosisCells in the reproductive organs divide by meiosis to form gametes.
- DNA and the genomeThe genetic material in the nucleus of a cell is a chemical called DNA.
- Genetic inheritanceA gamete is a sex cell.
- Inherited disordersSome disorders are inherited.
- Sex determinationOrdinary human body cells contain 23 pairs of chromosomes.
- VariationNo two individuals in a population are exactly alike.
- EvolutionEvolution is a change in the inherited characteristics of a population over time, through a process of natural selection.
- Selective breedingSelective breeding, also called artificial selection, is the process by which humans breed plants and animals for particular genetic characteristics.
- Genetic engineeringGenetic engineering is a process that modifies the genome of an organism by introducing a gene from another organism, to give a desired…
- Evidence for evolutionThe theory of evolution by natural selection is now widely accepted.
- FossilsFossils are the remains of organisms from millions of years ago, found in rocks.
- ExtinctionAn extinction happens when there are no remaining individuals of a species still alive.
- Resistant bacteriaBacteria can evolve rapidly because they reproduce at a fast rate.