We inherit traits from our parents because we inheritance one allele for each gene from each parent (two alleles total). The features that are expressed in us (i.e. the version inherited from our father or from our mother) is a question of probability.

We can use genetic diagrams to determine the probability of which features offspring would have.

This video looks using two types of genetic diagrams (including a Punnet's square) to determine phenotypic ratios.

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OTHER GENETICS VIDEOS:
Inheritance Explained: [ Ссылка ]
Genetic Modification Explained: [ Ссылка ]

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