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Question 2
Two mutant flies both have white eyes (red is the normal eye color) but
were each isolated in different labs and therefore have been labeled
white 1 (w1) and white 2 (w2). You cross a pure-breeding w1 fly to a
pure-breeding w2 fly and the progeny consists of only flies with wildtype (red) eyes.
a) How can this result be explained?
b) Write out the full genotypes of the parents with respect to the
mutant alleles and the genotypes of the progeny.
Question 3
Carnations with red, smooth petals are crossed with carnations with
white, rough petals. In the F1, all the petals are pink and smooth. The F1
intercross yields the following F2:
3/16 red, smooth
6/16 pink, smooth
3/16 white, smooth
2/16 pink, rough
1/16 red, rough
1/16 white, rough
a) What are the parental genotypes?
b) What are the F2 genotypes and phenotypes?
c) What conclusions can be made about the allelic and gene
interactions for both the petal color and texture alleles?
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