1) A particular variety of corncan have short, medium, or tall stems, and it can
ID: 5122 • Letter: 1
Question
1) A particular variety of corncan have short, medium, or tall stems, and it can have red, purple,or blue kernels. You cross a tall red variety with a short, blueone and obtain a medium, purple F1. You intercross theF1 to obtain an F2. The F2 showsnine phenotypic classes as follows:
Tall red
17
Tall purple
29
Tall blue
15
Medium red
34
Medium purple
63
Medium blue
31
Short red
16
Short purple
31
Short blue
15
Provide a simple genetic explanation of these results. Chooseyour own symbols and write the genotypes of the parental strains,the F1 and each F2 phenotypic class.
Tall red
17
Tall purple
29
Tall blue
15
Medium red
34
Medium purple
63
Medium blue
31
Short red
16
Short purple
31
Short blue
15
Explanation / Answer
TT, ===-tall
Tt----medium
tt- ==short
RR, =======red
Rr---purple
rr========-blue
tall red x shortblue
TTRR x ttrr
TR tr-gametes
TR tr medium,purple F1
TRtr medium,purple F1 x TR tr medium,purple F1
TR Tr Rt tr TR T r Rt tr----------- gametes
TR TR Tallred
T r Tr Tall blue
R t TR Mediumpurple
tr TR Mediumpurple
TR T r Tall purple
T r Tr Tall blue
R t T r Medium blue
tr T r Medium blue
TR R t Mediumred
T r R t Mediumpurple
R t R t Short red
tr R t Short purple
TR tr Medium purple
T r tr Medium blue
R t tr Shortpurple
tr tr Short blue
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