lec09 - Lecture 9 Modifications of Mendelian ratios...

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Picture 31 Picture 35 Lecture 9 – Modifications of Mendelian ratios (continued)  I. Interactions between mutations in different genes can modify 9:3:3:1 phenotypic ratios A. Interactions between genes in different pathways 1. corn snake – normal has orange and black (camouflaged) pattern - pattern due to two pigments, produced by two different pathways - what does this do to dihybrid ratios?       orange X black o + /o ; b + /b   X  o + /o ; b + /b o + /–; b + /– o + /–; b /b o /o ; b + /– o /o ;b /b B. Interactions between mutations in different genes in the same pathway.  1. either mutation causes same phenotype eg. pea flower  color 1
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Picture 40       white X white c + /c ; p + /p   X  c + /c ; p + /p c + /–; p + /– c + /–; p /p c /c ; p + /– c /c ;p /p 2. mutations cause different phenotypes
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lec09 - Lecture 9 Modifications of Mendelian ratios...

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