Question

please give an explanation!

(4 pts) A heterozygous genetic condition called "creeper" in chickens produces shortened and deformed legs and wings, giving the bird a squatty appearance. Matings between creepers produced 775 creepers : 388 normal progeny a) Is the genetic hypothesis of a 3 creeper:1 normal ratio acceptable? Use a chi-squared test to support and explain your answer. Make sure to state the following: genetic hypothesis, null hypothesis, work and calculations to calculate X2, the critical value: X.p.df, and conclusions of the results.

Answer 1

Given, 2 775 Normal = 388 ... Total = 775+388=1163. The Ratio b/w creeper" normal = 3:1 Chi square Expecteel categary I Oberned 775 creeper Ź x 1163 = 872.25 *1163 = 290-77 norma 388 T163 1163 so, the expected no. of creepers will be 872:25 and the expected no ay narnial will be 290.76. When rato becomes 3:1 . calculation at Mac à co-E)? A O = obrea Ez expected = (775-872-25) + (388-290-75) 372.25 290.7 = 10.84 + 32.522 Inte= 43.36 At 5% eu significance, the critical value of n² will be 3.841 conclusion No, the hypothesis of 3 creeper 1 normal is not possible as the value of nt exceeds the critical value.