You are interested in observing independent assortment in Drosophila melanogaste
ID: 317351 • Letter: Y
Question
You are interested in observing independent assortment in Drosophila melanogaster. You have established a true-breeding mutant line with curved wings (c), which is controlled by a single gene on chromosome 2, and sepia eyes (se), which is controlled by a single gene on chromosome 3. You establish a parental cross between true-breeding males with curved wings and sepia eyes and true-breeding wild-type females. You then mate the F1 males and females to generate the F2 offspring. Map out this cross below, including expected genotypes and phenotypes of males and females at all stages of the experiment. Include the expected phenotypic ratio for the F2 generation.Explanation / Answer
Curved wings[c] , sepia eyes [se]
cc sese males x CC Se Se Female
CcSese [F1]
CcSese x CcSese
Gemets
CSe
Cse
cSe
cse
CSe
CCSeSe Wild type
CCSese Wild type
CsSeSe Wild type
CcSese Wild type
Cse
CCSese Wild type
CCsese wild wings and sepia eyes
CcSese Wild type
Ccsese wild wings and sepia eyes
cSe
CcSeSe Wild type
CcSese Wild type
ccSeSe Curved wings and Wild eyes
ccSese Curved wings and Wild eyes
cse
CcSese Wild type
Ccsese wild wings and sepia eyes
ccSese Curved wings and Wild eyes
Ccsese Curved wings and sepia eyes
Now we can see according the rule on impendent assortment each genotype will assort, which must have to follow 9:3:3:1 phenotypic ratio and 1:1:2:2:4:2:2:1:1 genotypic ratio.
Wild type = 9
Curved wings and Wild eyes =3
Wild wings and sepia eyes =3
Curved wings and sepia eyes =1
CCSeSe = ccsese= ccSeSe = CCsese =1
CCSese = CcSeSe =CcSese= Ccsese=2
CcSese= 4
Gemets
CSe
Cse
cSe
cse
CSe
CCSeSe Wild type
CCSese Wild type
CsSeSe Wild type
CcSese Wild type
Cse
CCSese Wild type
CCsese wild wings and sepia eyes
CcSese Wild type
Ccsese wild wings and sepia eyes
cSe
CcSeSe Wild type
CcSese Wild type
ccSeSe Curved wings and Wild eyes
ccSese Curved wings and Wild eyes
cse
CcSese Wild type
Ccsese wild wings and sepia eyes
ccSese Curved wings and Wild eyes
Ccsese Curved wings and sepia eyes
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.