You obtained F1 from a cross of AABB X aabb. F1 produced the following number of...
You obtained F1 from a cross of AABB X aabb. F1 produced the following number of gametes
AB: 36 ab: 28 Ab: 14 aB: 18
To test whether A and B gens are linked or not, calculate chi-square value.
Please work out and explain each step!
Homework Answers
Answer:
Chi square calculations
Null hypothesis: A and B gens are NOT inked
Expected values 1:1:1:1 if NOT linked
|
Genotype |
Observed Number |
Expected Number =(Total / sum of ratio)*ratio |
χ2 value= (observed- expected)2 / expected |
|
AB |
36 |
(96 / 4 ) * 1= 24 |
(36-24)2/24= 6 |
|
ab |
28 |
(96 / 4 ) * 1= 24 |
(28-24)2/24= 0.66 |
|
Ab |
14 |
(96 / 4 ) * 1= 24 |
(14-24)2/24= 4.16 |
|
aB |
18 |
(96 / 4 ) * 1= 24 |
(18-24)2/24= 1.5 |
|
Total |
96 |
CHI SQUARE VALUE(sum) = 12.32 |
chi-square value for the observed data= 12.32
Degrees of freedom: (number of groups-1)= (4-1)= 3
Since the chi-square value is not significant the null hypothesis does not hold true
Hence the A and B gens are linked
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