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This site has been constructed based upon work supported by the National Science Foundation under Grant No. 0230587.
Breed Flies: Determining Genotype
The genotype of an organism can be determined from observing the organism and the characteristics of the organism's offspring. Here you can see how that is done by trying to determine the genotypes of pairs of flies based on their own traits and the traits of their offspring.You will attempt to determine the genotype for five "genes" that are represented by the letters A, B, C, D and E. The dominant trait is represented by a capital letter and the recessive trait is represented by a small letter. The phenotype "AbCdE" displays the dominant trait for A, the recessive trait b, the dominant form of trait C, the recessive form of d and the dominant form of E.
Trait A is sex linked so males inherit the trait only from the mother and whichever trait the mother's gene supplies will be the organism's phenotype.
Genotypes are represented by two letters (one for each gene). Thus, a fly with the genotype "Aa" contains one gene for dominant trait "A" and one gene with the recessive trait "a". The organism's phenotype will be "A".
Have fun trying to determine the genotypes of the pairs!