BIO SCI 93 Lecture Notes - Lecture 26: Eye Color, Meiosis, Wild Type

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1875-1890s- mitosis and meiosis via microscopy and cytology. Red eyes wild type flies vs white eyes mutant flies. Results of mating the white eyed male flies. Conclusion: fly"s eye color is linked to sex. Genes on a sex chromosome has unique inheritance patterns. https://www. khanacademy. org/science/biology/classical-genetics/chromosomal- basis-of-genetics/v/thomas-hunt-morgan-and-fruit-flies. Linkage between genes affect inheritance of 2 different characters. Genes on same chromosome that are inherited in genetic crosses= linked genes. Body color + wing size= inherited together b/c genes are on the same chromosome. https://learn. genetics. utah. edu/content/pigeons/geneticlinkage/ Breaking of linkage between genes on the same chromosome. Sex linked genes (x chromosome) lead to unique patterns of inheritance of-genetics/a/linkage-mapping level compared to males. Sex of offspring depends on if sperm has x or y chromosome. Females= 2 x chromosomes expressed at 2x the. Although females have 2 x, only 1 x is active. X chromosome condenses into barr body and inactivate genes.

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