3. Of course, the genetics of corn can be more complicated. Two genes, C and R,i
ID: 189278 • Letter: 3
Question
3. Of course, the genetics of corn can be more complicated. Two genes, C and R,interact duce kernel color. If at least one dominant allele is present at both genes the ypes of the Fi and use a Punnett square to show the possible genotypes and kernels will be colored, otherwise the kernels will be white. Diagram the genotypes and phenotypes of the F2 kernels from the following Parental ears of corn: CCrr What extension to Mendelian Genetics is affecting the phenotypic rati al ears of corn: CCrrxcCRRExplanation / Answer
Parental ears of corn:-
CCrr X ccRR ....................................Parent
CcRr ...................................................... F1 progeny (Yellow kernel)
After selfying F1 progeny offspring are as follows –
CcRr X CcRr ....................................Parent
CR
Cr
cR
cr
CR
CCRR
CCRr
CcRR
CcRr
Cr
CCRr
CCrr
CcRr
Ccrr
cR
CcRR
CcRr
ccRR
ccRr
cr
CcRr
Ccrr
ccRr
Ccrr (white)
As only one dominant gene is necessary for yellow kernel colour, so the phenotypic ratio is – 15:1
15 yellow kernel and one white.
This is one type of Mendelian inheritance and this is known as duplicate dominant epistasis having phenotypic ratio is 15:1 instead of having Mendelian phenotypic ratio 9:3:3:1.
CR
Cr
cR
cr
CR
CCRR
CCRr
CcRR
CcRr
Cr
CCRr
CCrr
CcRr
Ccrr
cR
CcRR
CcRr
ccRR
ccRr
cr
CcRr
Ccrr
ccRr
Ccrr (white)
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