17) In some plants, cyanidin, a red pigment (R-), is synthesized enzymatically f
ID: 268330 • Letter: 1
Question
17) In some plants, cyanidin, a red pigment (R-), is synthesized enzymatically from a colorless [whitel precursor compound. Delphinidin, a purple pigment (P), may be made from cyanidin by enzymatic action. True breeding purple plants (RRPP) crossed with true breeding white plants (rrpp) produce only purple plants. When two heterozygous purple plants [RrPp] were crossed, these Fa offspring resulted: Results: 79 purple: 28 red:39 white lal What type of inheritance is operating here? A. Epistasis Sex Linked C.Lethal D. Monohyrid Ibl What genetic ratio best explains the above results. Icl Give the possible genotypes for the F:offspring that were (3: White-rrpe Purple - R-FRedExplanation / Answer
17.a. The answer is epistasis.
b. The genetic ratio i.e. 9:3:4 (recessive epistasis) explains the above ratio.
c. Purple – R_P_
Red – R_pp
White – rrpp, rrP_
d.
Category
Purple
Red
White
Total
Observed values
79.00
28.00
39.00
146
Exptected Ratio
9
3
4
16
Exprected Values
82.125
27.375
36.5
82.125
27.375
36.5
Deviation
-3.125
0.625
2.5
D^2
9.765625
0.390625
6.25
D^2/E
0.118912
0.014269
0.171233
0.304414
X^2
0.304414
Degrees of freedom
3-1=2
i.
Observed values
79.00
28.00
39.00
146
Exprected Values
82.125
27.375
36.5
ii. 0.304
iii. 3-1 =2
iv. 5.99 (at 2 DF and 0.05 probability)
v. No. Because the calculate chisquare i.e. 0.304 is lessthan the table value i.e. 5.99 at 2 DF and 0.05 probability. Hence this It is accepted.
Category
Purple
Red
White
Total
Observed values
79.00
28.00
39.00
146
Exptected Ratio
9
3
4
16
Exprected Values
82.125
27.375
36.5
82.125
27.375
36.5
Deviation
-3.125
0.625
2.5
D^2
9.765625
0.390625
6.25
D^2/E
0.118912
0.014269
0.171233
0.304414
X^2
0.304414
Degrees of freedom
3-1=2
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