Homework Answers
A) Gene pair 1: White dominant =A, coloured recessive=a
Gene pair 2: Yellow dominant =B, green recessive=b
B)
AABB:White
AABb : White
AaBB: White
AaBb: White
AAbb: White
Aabb: White
aaBB:Yellow
aaBb: Yellow
aabb: Green
C) Epistatic interaction type: Complete dominance at both gene pairs, but one gene, when dominant, epistatic to the other.
Phenotypic ratio Expected white:yellow:green = 12:3:1
Phenotypic ratio observed 218:58:20 ῀ 12:3:1
D) The expected number for different phenotype is
White= (296/16)*12= 222
Yellow= (277/16)*3= 55
green= (277/16)*1=19
|
Observed |
Expected |
Row Totals |
|
|
White |
218 |
222 |
440 |
|
Yellow |
58 |
55 |
113 |
|
Green |
20 |
19 |
39 |
|
Column Totals |
296 |
296 |
592 (Grand Total) |
The chi-square is 0.1417.
p-value is 0.93. The result is not significant at p< 0.05
E) Thus, null hypothesis ‘both sets of data are different’ rejected and alternative hypothesis ‘both sets of data are not different’ accepted.
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