BIOL 1107 1nd Edition Lecture 29Outline of Last Lecture I. Dihybrid CrossII. Mendel’s Rules III. Incomplete DominanceIV. Codominance Outline of Current Lecture I. Epistasis II. Polygenic Traits Current LectureI. Epistasis- Epistasis- where two genes actually interact to perform co-colors - Black (B) + Brown (b) -> black and brown crossed ~ mostly black pups - (E) -> deposit color just fine (either brown or black)- (e) -> 2 e’s (can no longer deposit color)¼ BE ¼ bE ¼ Be ¼ be¼ BE BBEE BbEE BBEe BbEe¼ bE BbEE bbEE BbEe bbEe¼ Be BBEe BbEe BBee Bbee¼ be BbEe bbEe Bbee bbee- 9: 3:3:1 - 9: black; color- 3: black; no color- 3: brown; color- 1: no color- Q: In maize (corn) plants, a dominant..? (complete question on elc New)- A: (3/16) X (1600) = 300 kernels will be purple (heterozygous)o Work: dominant ~ inhibits kernel coloro Recessive~ permits colorThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.o 9:3:3:1o 9- no color, purpleo 3: no color, redo 3: color, purpleo 1: red, color II. Polygenic Traits- Polygenic traits- traits governed by more than one gene- Environmental factorso Some genes can be influences by the environmento Ex: Siamese kittens (when born, pure white -> enzyme not working) Color starts coming as they grow (enzyme starts working)- ***Genetics Problems Worksheet -> work these problems (similar problems will be on the
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