30. If 2 genes C and P controlling the production of flower pigment are involved

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 white

Explanation / 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)

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