Biology 1001A Lecture Notes - Lecture 11: Melanocortin 1 Receptor, Melanosome, Allele Frequency

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(cycle 6) lecture 11 - inheritance of variation in populations: general pathway of eukaryotic membrane protein production. Begins with two chromosomes, one chromosome with one allele and the other with another allele. The proteins then go into the endoplasmic reticulum. Then they go into the golgi complex in order to become vesicles. Then these vesicles containing the proteins are taken to the cells surface: general physiology of skin/hair pigmentation, ki(cid:374) a(cid:374)d hai(cid:396) (cid:272)olou(cid:396) is due to pig(cid:373)e(cid:374)ts (cid:272)alled (cid:862)melanins(cid:863, comes in 2 forms, pheomelanin (yellow-to-red, eumelanin (black) Involves epistasis: genes of pigment and hair interacted and affected each other in the result of the phenotype, one gene would be responsible for pigment creation and another gene would be responsible for pigment deposit, ex. Instead of 9:3:3:1 cross, it instead becomes a 9:3:4 cross: question: what would be expected phenotypic ratio of offspring from a dihybrid cross with the following process:

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