in pea plants, inflated pods(I) are dominant to constricted pods(i). In addition
ID: 23735 • Letter: I
Question
in pea plants, inflated pods(I) are dominant to constricted pods(i). In addition, axial stems (A) are dominant to terminal stems(a). a true breeding inflated axial plant (IIAA) is crossed with a true- breeding constricted terminal plant (iiaa). the F1 plants (IiAa) were allowed to inter breedwhat phenotypes would be expected in the F2 generation and what would be the expected ratios of the phenotypes?
suppose you observed the following results 189 inflated, axial plants; 67 inflated terminal plants 50 constricted axial plants 14 constricted terminal plants is this data consistent with the phenotypic ratio predicted above? chi square analysis
Explanation / Answer
in pea plants, inflated pods(I) are dominant to constricted pods(i). In addition, axial stems (A) are dominant to terminal stems(a). a true breeding inflated axial plant (IIAA) is crossed with a true- breeding constricted terminal plant (iiaa). the F1 plants (IiAa) were allowed to inter breed
what phenotypes would be expected in the F2 generation and what would be the expected ratios of the phenotypes?
PARENTAL ---------- IIAA X iiaa
f1-------------------IiAa
IiAa xIiAa
phenotypes ratio =9:3:3:1
inflated pods axial stems = 9/16
inflated pods terminal stems(= 3/16
constricted pods axial stems = 3/16
constricted podsterminal stems= 1/16
suppose you observed the following results 189 inflated, axial plants; 67 inflated terminal plants 50 constricted axial plants 14 constricted terminal plants is this data consistent with the phenotypic ratio predicted above? chi square analysis
E
O-E
6
OBSERVED
EXPECTED
O-E
(O-E)^2/E
inflated pods axial stems
189
180
9
0.45
inflated pods terminal stems
67
60
7
0.81
constricted pods axial stems
50
60
10
1.5
constricted podsterminal stems
14
20
6
1.8
320
calculate value is more than table vlaue hence null hypotheis is rejected
is data NOT consistent with the phenotypic ratio predicted
E
O-E
6
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