Use the following information to answer Questions 44 and 45.A space capsule crashes to Earth with an alien life-form aboard.Two creatures emerge from the capsule, one with green skin and one with yellow skin.The yellow creature soon gives birth to offspring fathered by the green creature, producing 12 green and 8 yellow offspring.Green skin in these diploid creatures is dominant to yellow skin.You are curious to find out if the number of offspring is significantly different from expected Mendelian ratios, so you perform a chi-square test.What is the chi-square value for this cross?
A)0)2
B)0)4
C)0)8
D)1)2
E)1)6

Question

Quizplus · Accepted Answer

To determine the chi-square value, we need to first calculate the expected ratios of offspring. With one parent being green (GG) and one parent being yellow (yy), the Punnett square gives us an expected ratio of 1:1 for green to yellow offspring. Therefore, out of 20 offspring, we would expect 10 green and 10 yellow.

To calculate the chi-square value, we use the formula:

(X^2) = Σ(O - E)^2/E

where O is the observed number of offspring and E is the expected number of offspring.

Using the numbers given, we get:

(X^2) = [(12-10)^2/10] + [(8-10)^2/10]

(X^2) = (4/10) + (4/10)

(X^2) = (8/10) = 0.8

Therefore, the chi-square value for this cross is 0.8, which is closest to answer choice C (0.8).

Use the Following Information to Answer Questions 44 and 45