Wild type Drosophila have grey bodies (B+), long wings (dp+),and non-hooked bristles (hk+). Recessive mutant alleles for two ofthese genes produce flies with dumpy wings (dp), and hookedbristles (hk). A dominant mutation in the body color gene createsflies that are black (B). An F1 female heterozygous for these threegenes is test-crossed and 1000 progeny are produced as follows:
wild type - 134
Black - 38
Black, hooked - 301
dumpy, hooked - 42
hooked - 20
hooked, dumpy, Black - 145
dumpy, Black - 16
dumpy - 304
A. What are the parental genotypes and phenotypes? (You mayassume that the parents are true breeding)
B. What is the genotype andphenotype of the tester fly?
C. Draw a map of the three genesthat indicates their positions and distances betweenthem
D. Draw the alleles in theirproper positions on the chromosome(s) of the triple heterozygote F1female.
Thank you very much.
Wild type Drosophila have grey bodies (B+), long wings (dp+),and non-hooked bristles (hk+). Recessive mutant alleles for two ofthese genes produce flies with dumpy wings (dp), and hookedbristles (hk). A dominant mutation in the body color gene createsflies that are black (B). An F1 female heterozygous for these threegenes is test-crossed and 1000 progeny are produced as follows:
wild type - 134
Black - 38
Black, hooked - 301
dumpy, hooked - 42
hooked - 20
hooked, dumpy, Black - 145
dumpy, Black - 16
dumpy - 304
A. What are the parental genotypes and phenotypes? (You mayassume that the parents are true breeding)
B. What is the genotype andphenotype of the tester fly?
C. Draw a map of the three genesthat indicates their positions and distances betweenthem
D. Draw the alleles in theirproper positions on the chromosome(s) of the triple heterozygote F1female.
Thank you very much.
