Sources of genotype variation Animation

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Individuals of a species have different combinations of alleles, which lead to variations in phenotype.
Five processes shape an individual's genotype.
Gene mutation is the only source of new alleles.
Crossing during meiosis I introduces novel combinations of alleles into chromosomes.
Independent assortment at meiosis I puts a mix of maternal and paternal chromosomes into each gamete.
Fertilization combines alleles from two parents.
A change in chromosome number or structure leads to the loss, duplication, or repositioning of genes.

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