30. If 2 genes C and P controlling the production of flower pigment are involved
ID: 3166174 • Letter: 3
Question
30. If 2 genes C and P controlling the production of flower pigment are involved in the pathway shown below where anthocyanin is a purple pigment and the precursor and intermediate do not produce the anthocyanin and are white which of the following ratios of progeny phenotypes in the F2 generation would most probably arise from a cross of the 2 white parents with genotypes CCpp X CCPP? Gene PrecursorIntermediate Anthocyanin Genotype C-pp ce pp A) 8 purple:8 white B) 15 purple:1 white C) 12 purple: 4 white D) 4 purple: 12 white E) 9 purple:7 whiteExplanation / Answer
Answer:
E). 9 purple: 7 white
Explanation:
CCpp x ccPP ---Parents
CcPp (purple)—F1
F1 x F1
CcPp x CcPp
CP
Cp
cP
cp
CP
CCPP (purple)
CCPp (purple)
CcPP (purple)
CcPp (purple)
Cp
CCPp (purple)
CCpp (white)
CcPp (purple)
Ccpp (white)
cP
CcPP (purple)
CcPp (purple)
ccPP (white)
ccPp (white)
cp
CcPp (purple)
Ccpp (white)
ccPp (white)
ccpp (white)
Purple = 9
White = 7
CP
Cp
cP
cp
CP
CCPP (purple)
CCPp (purple)
CcPP (purple)
CcPp (purple)
Cp
CCPp (purple)
CCpp (white)
CcPp (purple)
Ccpp (white)
cP
CcPP (purple)
CcPp (purple)
ccPP (white)
ccPp (white)
cp
CcPp (purple)
Ccpp (white)
ccPp (white)
ccpp (white)