14Mapping - If a female Drosophila with the genotype b + pr...

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Mapping Techniques Determining the genetic distance between linked genes: theory Genes A and E: Genes A and D: Genes A and B: Genes A and C: Determining the genetic distance between linked genes: 3-point mapping A female Drosophila heterozygous for purple eyes, vestigial wings, and black body is crossed to a male homozygous recessive (mutant) for all three traits. 1000 progeny are produced, with the following phenotypes: pr b vg 57 pr + b + vg + 62 pr + b vg 26 pr b + vg + 28 pr + b + vg 416 pr b vg + 405 pr + b vg + 4 pr b + vg 2 Diagram the female parent’s genotype and indicate the genetic distance between the genes. Using the genetic distance to determine progeny for linked genes
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Unformatted text preview: If a female Drosophila with the genotype b + pr / b pr + is mated with a male that is b pr / b pr, what are the expected genotype ratios for their progeny? You need to know whether genes are independent or linked, and, if linked, the genetic distance between them. Determining the physical location of sequences on chromosomes: physical mapping fluorescence in situ hybridization (FISH), Figure 20.4 p 555 karyotype Giemsa stain G-banding, Figure 8.1 p. 195 p arm and q arm 24 A A a a D d d D E E e e c c C C B B b b...
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