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

Biology (MindTap Course List)
11th Edition
ISBN:9781337392938
Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Chapter11: The Basic Principles Of Heredity
Section: Chapter Questions
Problem 12TYU: Genes A and B are 6 map units apart, and A and C are 4 map units apart. Which gene is in the middle...
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  1. 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 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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