The Kidd blood group in primates is inherited as a single gene with two codomina
ID: 272357 • Letter: T
Question
The Kidd blood group in primates is inherited as a single gene with two codominant alleles (Jka and Jkb). We would like to verify that this locus actually follows simple Mendelian inheritance with codominant alleles in gibbons. We have a pure breeding population of Type Jka and a pure breeding population of Type Jkb. We create an F2 population and test for the antigens.
Jka: 34
Jka Jkb: 81
Jkb: 34
Perform a chi square analysis on this data using the following hypothesis:
The mode of inheritance for the Kidd blood group in gibbons is simple Mendelian with codominant alleles.
Calculate the chi square value and place it in the space below. Round to three decimal places.
(How to calculate expected ratio? should it be 34/149 x 16, 81/149 x 16?)
Explanation / Answer
Answer:
Jka Jka x Jkb Jkb --------Paretns
Jka Jkb --------------F1
F1 x F1
Jka
Jkb
Jka
Jka Jka
Jka Jkb
Jkb
Jka Jkb
Jkb Jkb
Expected F2 ratio: Jka(1) : Jka Jkb (2) : Jkb(1) = 37.25 : 74.5: 37.25
Observed ratio = 34 : 81 : 34
Phenotype
Observed(O)
Expected (E)
O-E
(O-E)2
(O-E)2/E
Jka
34
37.25
-3.25
10.563
0.284
Jka Jkb
81
74.5
6.5
42.250
0.567
Jkb
34
37.25
-3.25
10.563
0.284
149
149
1.134
Chi-square value = 1.134
Jka
Jkb
Jka
Jka Jka
Jka Jkb
Jkb
Jka Jkb
Jkb Jkb
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