Within a certain species of plant there can be orange, red or white flowers. In
ID: 317832 • Letter: W
Question
Within a certain species of plant there can be orange, red or white flowers. In a mating of white flower and orange flower parents, all F1 progeny had red flowers. Two F1 progeny were crossed to produce the following F2 phenotypes: How many bi-allelic genes control flower color? What are the expected phenotypic counts under your hypothesis? Use chi square goodness of fit test to evaluate your hypothesis. Give generalized genotypes for the F1 mates and F2 progeny (i.e. use an underline to designate any ambiguous parts of a genotype, like A_ to correspond to the genotype determining a dominant phenotype).Explanation / Answer
In mating of white flower and organe flower plant , all f1 progeny had red flowers
Orange -------genotype=RR
White -------genotype=rr
Red -------genotype= Rr
Orange -------genotype=RR X White -------genotype=rr
F1-OFFSPRING-------- Red -------genotype= Rr
F1-OFFSPRING Rr X F1-OFFSPRING Rr
gametes
R
r
R
RR Orange
Rr Red
r
Rr Red
rr White
observed
Expected
(o-e)
(o-e)^2/e
RR Orange
160
207.5
-47.5
10.87
Rr Red
460
415
-45
4.87
rr White
210
207.5
2.5
0.03
830
15.77
Answer : incomplete dominance , two alleles
Null hypothesis: Flower color is controlled by two allele
Alternative hypothesis : Flower color is not controlled by two allele
Calculate x value is more than table value at 5% level of significane
Hence accept alternative hypothesis
gametes
R
r
R
RR Orange
Rr Red
r
Rr Red
rr White
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