Powerpoint lecture covering the following in a modern, concise format:
Specification Point 3.19 - Understand how genes exist in alternative forms called alleles which give rise to differences in inherited characteristics.
Specification Point 3.20 - Understand the meaning of the terms: dominant, recessive, homozygous, heterozygous, phenotype, and genotype.
Specification Point 3.21B - Understand the meaning of the term codominance.
Complete set of Chapter 5 Lectures are available.
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