Question

6. A homozygous strain of yellow corn is crossed with a homozygous strain of pürple corn. The F1 are yellow kernels (the progeny)- a) Does the pattern of inheritance follow a monohybrid cross for a simple dominant trait? Explain using a chi-squared analysis ellow kerrel s tntercrossed, producing an ear of corm with 119 purple kernels and 89 to df I P<0 005 b) Propose another hypothesis for the method of inheritance. apistasiS a: vati c) Calculate the chi-square value for this cross, based on your hypothesis. 0 of d) Look up the p-value in the chi-square table provided on the last page. Should yo reject or fail to reject (accept) your hypothesis, using a significance level of 5% the degrees of freedom in your calculation value
Could you verify that my answers are correct, please.

Answer 1

a)

Category	Purple	Yellow	Total
Observed values	119	89	208
Exptected Ratio	3	1	4
Exprected Values	156	52
Deviation	-37	37
D^2	1369	1369
D^2/E	8.775641	26.32692	35.10256
X^2	35.10
Degrees of freedom		-	1

Inference: As the calculated chisquare value i.e. 35.10 is greater than the table value i.e. 3.84 at 1 DF and 0.05 probability, the hypothesis is rejected.

b) 9:7 – Complementary gene action

c)

Category	Purple	Yellow	Total
Observed values	119	89	208
Exptected Ratio	9	7	16
Exprected Values	117	91	208
Deviation	2	-2
D^2	4	4
D^2/E	0.034188	0.043956	0.078144
X^2	0.08
Degrees of freedom		-	1

Inference: As the calculated chisquare value i.e. 0.08 is less than the table value i.e. 3.84 at 1 DF and 0.05 probability, the hypothesis is accepted.