PCB 3063 Lecture Notes - Lecture 6: Dihybrid Cross, Epistasis, Inflectional Phrase
17 Dec 2018
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A balance between getting enough vitamin d but not too much to where folic acid in the body is destroyed. There are quite a few genes that control this, at least three or four that we of. It"s really a dosage based on how many of each of the alleles you have. Darker skin color is dominant, and this is the additive effect of many gene interactions. Note that this is a continuum, not a definitive break from person a to person b. You have modified dihybrid ratios (9:7) or (15:1) and it adds up to 16, you can be sure there are two genes that influence each other: note that the genes still segregate independently. This is what differentiates it from a regular dihybrid cross which have two phenotypes: complimentary gene action is when two genes work together to produce a phenotype. Corn kernels are an example, as you get a 9:7 ration when there"s complimentary gene interaction.
