You are a plant molecular geneticist and have decided to study petal color in Za
ID: 151412 • Letter: Y
Question
You are a plant molecular geneticist and have decided to study petal color in Zania flowers. You apply a mutagen to the flowers, and self-crossed on of the mutated plants. The F1 generation yielded 7 pure breeding mutant flowering plants (labeled AG). When you backcross each of the mutants with the wild type parent, the F2 were 3 orange:1 black. You next decide to determine whether the alleles are from different genes or the same gene.
A x B = orange
A x C = orange
A x D = black
A x E = orange
A x F = orange
A x G = black
B x C = black
B x D = orange
B x E = black
B x F = black
B x G = orange
C x D = orange
C x E = black
C x F = black
C x G = orange
D x E = orange
D x F = orange
D x G = black
E x F = black
E x G = orange
F x G = orange
What is the wildtype phenotype? Mutant?
Explanation / Answer
According to question , from the backcross between mutant & wild type parents, F2 obtained =3 Orange : 1 black (shows orange is dominant over black)
And in next generation cross - out of 21 progenies ; 12 are orange & 9 are black; so, it is clear that wildtype phenotype is Orange, & Black is mutant one.
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