Variation
- Created by: EleanorRose.
- Created on: 05-02-15 11:47
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- Variation
- Interspecific variation
- When there is a difference between species
- Intraspecific variation
- When there is a difference between the same species
- Measurements
- Usually measuring aspects of living organisms
- All living organisms are different
- Therefore many measurements are required
- All living organisms are different
- Usually measuring aspects of living organisms
- Variation is usually due to DNA
- Differences between species are due to structure and sequence of genes in each organisms and how genes are expressed
- A gene can only have an impact if it is switched on
- Genotype is the genetic makeup which is inherited from parents
- Pheotype is th collection of observable features that it has
- Genotype + environment = phenotype
- Cause of Variation
- Sexual reproduction involves the production and fusion of gametes
- Gametes are produced by meiosis
- Variation occurs during meiosis
- Cross over of parts of chromosomes
- Variation occurs during meiosis
- Gametes are produced by meiosis
- Sexual reproduction involves the production and fusion of gametes
- Joining gametes during fertilisation introduces variation
- Random mating occurs between individuals, 2 different sets of genes brought together
- Random fertilisation, each event is random and which gamete pairs fuse is random
- Mutation
- Change in genetic material of an organism
- Gene mutation is when the base sequence of a gene changes resulting 9 the change in the amino acid sequence
- This may affect the overall shape and therefore functioning of the protein
- Gene mutation is when the base sequence of a gene changes resulting 9 the change in the amino acid sequence
- Creates new alelle
- Change in genetic material of an organism
- Environmental
- Expression of genes may be affected by the environment of an organism, characteristics are affected by environment
- Some variation can be affected by both environmental and genetic factors
- Interspecific variation
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