A blackcolored alien is crossed with a white alien and all t

A black-colored alien is crossed with a white alien and all the offspring are black. Two of these black offspring are crossed together and produce the following offspring: 385 black and 125 white. Perform a Chi-square test to determine whether the color data are consistent with a single locus with a black allele and a white allele. Remember to include the null hypothesis, the Chi-square value, degrees of freedom, p-value, and the conclusion.

Solution

B1(Black alien)/Black

W1(White alien)/White

Total

385

125

3/4 * 510= 382.5

1/4 * 510 = 127.5

(Chi square statistics) X² = (385- 382.5)² /382.5 + (125- 127.5)² / 127.5 = 0.016 + 0.049 = 0.065,

Null Hypothesis (H_o) = Original distribution is correct.

Using (Degrees of freedom) df = 1, 0.065 the table (p) value, 5.25 -Chi-square value is high so the data is consistant with incomplete dominance.