Construct a genetic map using the following data: A line of drosophila has been constructed with three recessive mutations: sc = loss of thorax bristles ("scute") ec = roughened eye surface ("echinus") vg = vestigial wings The dominant, wild-type version of each allele could be written as vg + or ec+, but we will write them just as "+" for simplicity. P generation: We cross homozygous recessive flies (sc ec vg / sc ec vg) with homozygous dominant (wild-type) flies (+ + + / + + +). F1 generation: All of the flies produced by the parental cross have the dominant (wild-type) phenotype. Genetically, these flies are: (sc ec vg / + + + ). F2 generation: We produce an F2 generation by mating the F1 flies with homozygous recessive flies (sc ec vg / sc ec vg) This cross produces an F2 generation with 8 different phenotypes: All wild type features – 430 echinus – 5 echinus, vestigial – 29 scute – 25 scute, echinus – 44 scute, echinus, and vestigial – 417 scute, vestigial – 4 vestigial – 37 Using the genotype abbreviations for the observed phenotypes, list the offspring’s phenotypes in order of most offspring to least Observed Phenotype No. of Offspring
- Construct a genetic map using the following data:
A line of drosophila has been constructed with three recessive mutations:
sc = loss of thorax bristles ("scute")
ec = roughened eye surface ("echinus")
vg = vestigial wings
The dominant, wild-type version of each allele could be written as vg + or ec+, but we will write them just as "+" for simplicity.
P generation:
We cross homozygous recessive flies (sc ec vg / sc ec vg) with homozygous dominant (wild-type) flies (+ + + / + + +).
F1 generation:
All of the flies produced by the parental cross have the dominant (wild-type) phenotype. Genetically, these flies are: (sc ec vg / + + + ).
F2 generation:
We produce an F2 generation by mating the F1 flies with homozygous recessive flies
(sc ec vg / sc ec vg)
This cross produces an F2 generation with 8 different
All wild type features – 430 echinus – 5
echinus, vestigial – 29 scute – 25
scute, echinus – 44 scute, echinus, and vestigial – 417
scute, vestigial – 4 vestigial – 37
Using the genotype abbreviations for the observed phenotypes, list the offspring’s phenotypes in order of most offspring to least
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Observed Phenotype |
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