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Variation
Topics to cover
Variation
Genetic Basis
How else is allele frequency in a population changed?
Natural Seletion
The Darwin-Wallace theory of evolution by natural selection
Species and speciation
The Hardy-Weinberg principle
Artificial selection
Crop Improvements
Inbreeding and Hybridisation in Maize
Topics to cover
Variation
Enviormental Effects On The Phenotype
Natural Selection
Evolution 1
, Genetic Drift
The Hardy-Weinberg Principle
Artificial Selction
Crop Improvement
Inbreeding and Hybridisation in Maize
The Darwin-Wallace Theory of Evolution by Natural Selection
Species and Speciation
Allopatric Speciation
Sympatic Speciation
Molecular Comparison Between Species
Extinctions
Variation
What is Variation?
🦍 The differences in phenotype between individuals of the same or different
species
Sources of Variation
Independet Assortment of Chromosomes, and therefore alleles, during meiosis
During Metaphase 1 genes of alleles assort independently of one another
During Anaphase 1 these genes seperate
Hence gametes are varied
Evolution 2
, Crossing over between Chromatids of homologous chromosomes during
meiosis
When homologous chromosomes line up in metaphase 1 crossing over
between chromosomes mean there is an exchange of alleles.
Random Fertilisation of Gametes
Random mating between organisms in a species
Mutations
Random mutations in DNA cause mutations
What is Discontinuous Variation
Qualatative phenotypic variation
Seperated into clear categories with no intermediates
Individuals can be evenly or unevenly distributed between phenotypes
🦍 Little influence from the enviorment
Continuos Variation
Quantitative Phenotype
Character doesn't fall into clearly distinguishable categories
Covers a range with limits
Show normal distribution
Due to the interactions of many genes
Influence of the enviorment
Genetic Basis
Discontinuous
Evolution 3
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