In a certain plant, flowers can be either white, red or blue. The following crosses were...
In a certain plant, flowers can be either white, red or blue. The following crosses were performed with different flower colour varieties:
Cross 1:
P: red x red
F1: all red
F2: all red
Cross 2:
P: blue x red
F1: 148 blue, 149 red, 103 white
Cross 3:
P: blue x white
F1: all blue
F2: 221 blue, 79 red, 100 white
Based on the crosses, how many genes control flower colour? Include a chi-square test to support your answer for the F2s in the third cross.
What are the genotypes that control flower colour?
What are the genotypes for each of the plants in the crosses?
Draw a pathway that explains the results.
Homework Answers
Based on the above crosses, two genes control the flower color.
Find the below images for flower genotypes and crosses.
The gene interaction here is recessive epistatic. In recessive epistatic, the recessive alleles at first locus mask the expression of genes at the second locus, so, the ratio will change into 9:3:4.
Cross 1:
Cross 2:
Null hypothesis: The observed values are not deviating from the expected ratio of 3:3:2.
Chi-square test:
Inference: The calculated chi-square value i.e. 0.123 is less than the table value i.e. 5.99 at 2 DF and 0.05 probability, hence the null hypothesis is accepted.
Cross 3:
Null hypothesis: The observed values are not deviating from the expected ratio of recessive epistasis.
Chi-square test:
Inference: The calculated chi-square value i.e. 0.284 is less than the table value i.e. 5.99 at 2 DF and 0.05 probability, hence the null hypothesis is accepted.
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