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Modern Genetic Analysis
6. Gene Interaction
Key Concepts

When two different recessive mutant alleles are combined in one cell and the phenotype is mutant, the mutations must be in the same gene.
When recessive mutant alleles are combined in one cell and the phenotype is wild-type, the mutations must be in different genes.
The phenotypes of some heterozygotes reveal types of dominance other than full dominance.
Some mutant alleles can kill the organism.
Most characters are determined by sets of genes that interact with one another and with the environment.
Modified monohybrid ratios reveal allelic interactions.
M. odified dihybrid ratios reveal gene interactions.

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