Measurement in experimental organisms such as Drosophila

Measurement in experimental organisms such as Drosophila -...

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Measurement in experimental organisms such as Drosophila A female Drosophila melanogaster laying an egg. Note her (wild type) red eye colour. From Microsoft Encarta Encyclopedia The first observation of data from a dihybrid cross which did not fit the predicted Mendelian 9:3:3:1 ratio were made by Bateson and Punnett investigating genes affecting flower pigmentation and seed shape in sweet peas. However, the first thorough investigation was conducted by Thomas Hunt Morgan using the fruitfly Drosophila melanogaster. To minimize the variables he considered a cross between fruitflies in which the females were heterozygous at two loci, the genes purple and vestigial (one affecting eye colour and the other wing shape) while the males were homozygous for each mutant gene. The mutant alleles are written pr and vg respectively and the " wild type " alleles are written pr + and vg + . Morgan's First Cross: "precross" pr + pr + vg + vg + x prpr vgvg / / / / backcross pr + pr vg + vg x prpr vgvg (females)
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This note was uploaded on 11/22/2011 for the course CHEMISTRY CHM1025 taught by Professor Laurachoudry during the Fall '10 term at Broward College.

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Measurement in experimental organisms such as Drosophila -...

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