Consult a chi square values and probability table such as th

Consult a chi square values and probability table such as that in your textbook (Table 2.1) to interpret a chi square value of 4.12 for a monohybrid cross of two pea plants heterozygous for purple flowers (Pp). Which of the following are correct concerning the chi square analysis of the flower color results of this cross (select best answer)?

a) p < 0.05; do not support a dominant-recessive inheritance pattern.

Solution

a) p < 0.05; do not support a dominant-recessive inheritance pattern.

It is given that the chi-square value is = 4.12

Assuming that the genes are following dominant-recessive inheritance pattern, the degrees of freedom is = 2-1 = 1

The calculated p-value is 0.042379, which is significant at p < 0.05

The chi-square value indicates significant difference in the expected inheritance pattern, means the genes are not assorting independently (no dominant-recessive inheritance pattern).