BIOL207 Lecture : BIOL 207 Lecture Note BUNDLE (October 23 - December 2)
15 Dec 2013
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Lecture 18: interaction between genes part 1 (con"t) | lecture 19: Two genes are both needed to produce a wt phenotype. Harebell: two white flowers cross to create blue coloured flower. F2 generation has a 9:7 ratio (blue:white: explanation: White precursor white intermediate blue end product: a different enzyme is needed at each transition. Or there are 2 subunits of one enzyme. Only one of 2 is needed to produce the wild phenotype. F2 generation has modified 9:3:3:1 ratio (15:1: ex. Range in skin tone: there are no distinct expressions. Opposite of continuous variation = discontinuous variation. If there is one gene and there was continuous variation . P = purple and white purebreeding flower. P = pureple and white purebreeding flowers (a/a;b/b crossed with a/a;b/b) F2 = 9:3:3:1 ratio of colours (purple:lightpurple:lightpink:white) One gene"s recessive phenotype is interrupting expression of another, second gene.
