Alleles are inherited from each parent and their combination is unpredictable due to random assortment during cell formation.
Alleles are different versions of a specific gene that individuals inherit from each parent. When it comes to predicting which two alleles each parent contributes for a given gene, it is impossible due to the random assortment of alleles during the formation of reproductive cells. This random process leads to a variety of allele combinations in offspring.
For example, if a gene for eye color has two alleles (brown and blue), a parent may contribute a brown allele while the other contributes a blue one, resulting in a child with a heterozygous genotype for eye color. This genetic variability is what makes it impossible to predict the exact allele combination from each parent.
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