ACBS 312 Lecture Notes - Lecture 4: Blood Orange, Inbreeding, Genotype
2 Oct 2018
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Practice problems 4: modification of mendelian ratios: give the expected genotypic and phenotypic ratios for the following crosses for. One had red flowers, on yellow flowers, and one white flowers. She determined that flower color was controlled by three alleles at a single gene. Red was found to be codominant with yellow, and both alleles dominant to white. Some of the crosses she made and the resulting progeny are listed below: 1 red: 2 orange: 1 yellow: designate each allele with an appropriate gene symbol. 1/4orange:2/4yellow:1/4yellow= 1:2:1: in a unique species of plants, flowers may be either yellow, blue, red, or mauve. A pure-breeding line with blue flowers is crossed to a pure-breeding red-flowered line, and the resulting f1 plants have yellow flowers. In the f2 the following ratio is observed: 9/16 yellow: 3/16 blue: 3/16 red: 1/16 mauve. If pure-breeding yellow and mauve plants are crossed, the same f2 ratio is observed.
