I really need some help withthis question.... thank you for helping me!!! We obs
ID: 5666 • Letter: I
Question
I really need some help withthis question.... thank you for helping me!!! We observe 340 wrinkled and 660 round pea plants inthe F2 generation. Calculate the chi-square value of thiscross, and determine if the principle of segregation explains theseresults. Use a standard table for chi-square values(X2). I really need some help withthis question.... thank you for helping me!!! We observe 340 wrinkled and 660 round pea plants inthe F2 generation. Calculate the chi-square value of thiscross, and determine if the principle of segregation explains theseresults. Use a standard table for chi-square values(X2). We observe 340 wrinkled and 660 round pea plants inthe F2 generation. Calculate the chi-square value of thiscross, and determine if the principle of segregation explains theseresults. Use a standard table for chi-square values(X2).Explanation / Answer
R = dominant round allele,
r = recessive wrinkled allele.
RR x rr.
Wrinkled round pea
r.
r.
R
Rr,
Rr,
r
rr,
r. r.
50% round, 50%wrinkled
expected frequencies = 500: 500
Observed frequencies= 660: 340
he symbol for chi-square and the formula are asfollows:
=SUM OF (O-E)2 /E
where
O is the observed frequency, and
E is the expected frequency.
The degrees of freedom for the one-dimensional chi-squarestatistic is:
df = C - 1
expected frequencies
Observed frequencies
(O-E)2
((O-E)2/ /E
Wrinkled
500
340
25600
51.2
round pea
500
660
25600
51.2
100
1000
104.4
X-squared = 102.4, df = 1, p-value < 2.2e-16
r.
r.
R
Rr,
Rr,
r
rr,
r. r.