Question

A variety of pure-breeding snapdragons produces a tall plant with green seeds (WWSS). A second variety of pure-breeding snapdragons produce a short plant with white seeds (wwss). The two varieties are crossed, and the resulting seeds are collected. All of the seeds are green and when planted, they produce all tall plants (WwSs). These tall F1 plants are allowed to self-fertilize. The results for seeds and plant height in the F2 generations are as follows. What is the Х ²
value, and the degrees of freedom for this experiment?

F2 Plant phenotype	Observed #
Green seed, tall	451
White seed, tall	243
Green seed, short	221
White seed, short	85
Total	1000

		Х2 = 52.6, df = 3
		Х2 = 52.6, df = 4
		Х2 = 1.2, df = 3
		Х2 = 1.2, df = 4
		Х2 = 52.6, df = 1
		Х2 = 1.2, df = 1

Answer 1

CO @ plant Phenotype Observed | Expected 10-E) Green Seed, 451 19X1000 =5425 111.5 tall 3 x1000 =187.5 55.5 white seed, tell 943 Green Seed Short 221 3x1600 = 1874 33.5 +*1000 --(2-5 22.5 160-€12 124382 13080-2 1122.2 |506-2 white seed short) 85 1000 V3

Chi square value is 5806 degree of fureedom - Thorel (3) As in dinybrid cross there are four possible Classes of offspring so degree of freedom of a noroy classes - 1 4 14-153 80 option A correct. To calculate expected assume it as dihybrid coes So ratio is 91313!1.
so option 1 correct