Mendelian Inheritance
Review (1 page)
Concept 6: Trait Analysis Short Legs
Concept 7: Trait Analysis Orange Eyes and White Skin
Practice (2 pages)
Practice (2 pages)
Concept 9: Trait Analysis Vertical Eyes and Tooth
Practice (1 page)
Concept 6: Trait Analysis: Short Legs 4
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Interpreting the Results
F2 Analysis
How is the short-legs trait inherited? Let us first study the parental cross of the short-legged female with the normal-legged male:  All sons have the same phenotype as the mother and all daughters have the same phenotype as the father. The simplest hypothesis is that the short-legs trait is caused by an X-linked recessive allele. Let us go through the crosses with genotypes to see if this could be the case. We will use s for the short-legs allele and S for the normal-legs allele. If all male offspring of a mutant female and true-breeding normal male have the mutant phenotype and all female offspring have the normal phenotype, the trait is inherited as an X-linked recessive.
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  Results of the Cross: The F2 Generation
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