Data Table 5. Dihybrid Punnett square (F 2 generation). F 2 Generation Parent 1
ID: 71089 • Letter: D
Question
Data Table 5. Dihybrid Punnett square (F2 generation).
F2 Generation
Parent 1
PS
Ps
pS
ps
Parent 2
PS
PPSS
PPSs
PpSS
PpSs
Ps
PPSs
PPss
PpSs
Ppss
pS
PpSS
PpSs
PpSS
ppSs
ps
PpSs
Ppss
ppSs
ppss
Data Table 6. Expected and Observed Values Dihybrid.
Purple & Smooth
Purple & Wrinkled
Yellow & Smooth
Yellow & Wrinkled
Total Counted
Expected
493
Observed
Corn Side A:
51
27
19
3
100
Corn Side B:
89
22
25
12
148
Corn Side C:
87
17
34
8
146
Corn Side D:
63
21
11
4
99
Total
(A + B + C + D)
290
87
176
27
493
Need expected and observed numbers?
Data Table 7. Chi-Square Values for a Dihybrid Cross.
Values
Answers
Chi-square value
Degrees of freedom
P-value
A. What is the percent error for each of the four phenotypes between the expected kernel numbers (calculated from the Punnett square) and the observed kernel numbers?
B. What was the expected phenotypic ratio (as would be for all breeding), between two true-breeding parents? What was the observed phenotypic ratio, as determined from the observed data recorded in Data Table 6?
F2 Generation
Parent 1
PS
Ps
pS
ps
Parent 2
PS
PPSS
PPSs
PpSS
PpSs
Ps
PPSs
PPss
PpSs
Ppss
pS
PpSS
PpSs
PpSS
ppSs
ps
PpSs
Ppss
ppSs
ppss
Explanation / Answer
The expected no. are
Corn Side A:
The chi squre values are:
Data table 7:
Thus, the X2 = 33.4
Corn Side A:
58.82 17.65 18.05 5.48 100 Corn Side B: 87.06 26.12 26.72 8.11 148 Corn Side C: 85.88 25.76 26.36 8.00 146 Corn Side D: 58.24 17.47 17.87 5.42 99 Total 290 87 89 27 493 (A + B + C + D)Related Questions
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