- You are given the task of creating a genetic map of three genesof Drosophila melanogaster . The genes are all located onthe same chromosome. The genes are for body color, eye color andantenna formation. The alleles for body color are yellow and gray(wild-type), the alleles for eye color are sepia and red(wild-type) and the alleles for antenna are short and normal(wild-type). The mutant alleles for body and eye color arerecessive, while the mutant allele for antenna formation isdominant. You follow the procedure for determining the order andmap distance for the genes and obtain the following data:
Short, gray, sepia= 240 Short, yellow, red = 2 Short, yellow, sepia = 500 Short,gray, red = 22 Normal, yellow, red = 270 Normal, gray, sepia = 5Normal, yellow, sepia = 15 Normal, gray, red = 444
Hints for drawings:size matters! Don’t draw all genes equidistant. If two genes arefurther away from each other than another set, make sure to draw itthat way.
Based on the data given:
- Define each gene and allele. Based on how you defined thealleles, what was the genotype and phenotype of the P gen? Makesure to notate alleles properly and to draw the chromosomescorrectly. Make sure the genes are in the correct order.
- What was the genotype and phenotype of the F1 gen? Make sure tonotate alleles properly and to draw the chromosomes correctly. Makesure the genes are in the correct order.
- What was the genotype and phenotype of the Test cross that wasperformed? Make sure to notate alleles properly and to draw thechromosomes correctly. Make sure the genes are in the correctorder.
- What are all of the map distances between the genes given? Makesure to draw the chromosomes correctly, the genes are in the properorder and units are used.
