For example, when recording genotypic ratios:ġ) If your offspring genotypes include 1 GG, 2 Gg, and 1 gg, the ratio would be: 1 GG : 2 Gg : 1 ggĢ) If your offspring genotypes include 2 GG and 2 Gg, the ratio would be: 2 GG : 2 gg (or 1:1 in the reduced form)ģ) If your offspring genotypes are 4 gg, then the ratio would be written as:: 4 gg When you record a ratio, whether it is genotypic or phenotypic ratio, always record the most dominant characteristic first, followed by the recessive. Part II: Follow the instructions in the Question column to complete the virtual lab scenarios and record your data:Ĭomplete all ten scenarios and record your results in Table 1. What can you conclude about the genotypes of the parent flies? Some of the offspring of two gray bodied flies are black. You cannot conclude anything definitively about the parental genotypesĥ. What can you conclude about the genotypes of the parent flies?ĭ. All of the offspring of two gray bodied flys are also gray. Using the letter G to represent body color, what is the genotype of a heterozygous gray bodied fly?Ĥ. In fruit flies, gray body color is dominant over black body color.
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