a4
d
stude
LS 4.2 1't midterm April 28, 2008
nt name
student
number
Disc section
(circle
one) Wed at 11, Wed at 1, Wed at 3,Thur
at 9, Thur
at 11,
Thur
at 1
9
total
bonus
1. Tall plants with yellow
flowers
crossed
with short plants with white
flowers
yield all
tall
progeny
with white
flowers.
Self crosses of
these Fl yield
these F2 out of 160
total
progeny:
Observed
numbers
expectednumbers chisquaredvalues
Tall white
100
7O
Short white 21
30
Tall yellow 25
3 o
Short
vellow 14
/o
TAB
LE
4. I
Crltlcal Chl Square Valuer
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a. Write out a null hypothesis
laying
out a genetic
explanation
for
these
results.
,
2
Sr.
d^
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t Ttcl
(
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b. List
the numbers
expected
of your model
in
the space above, next
to the observed
numbers.
Test your hypothesis
by chisquared
analysis.
Show all your work
in
calculating
the chisquared
values
and
total.
c. How many degrees
of
freedom
are appropriate?
.3
On
this copy of the chisquared
table
place a visable
X at
the
location
on the
table of your chisquared
value
(calculated
above) and degrees of freedom. Draw an arrow
from
the X to the p value. What
is the p
value?
/A
f"
10
4
Degrees
ol
freedom
Null Hypotherlr A((epted
0,99
0.90
o.50
Null Hypotheslr
R
€
lected
o.05
0.01
o.ool
x',
trls
I
0.02
45
2
3.44
6.64
I O.A3
)
0^02
0.2r
'I
.39
4
5.99
9.21
l:I.42
0.11
0,58
2.17
7.41
I1.35
r6.27
0.30
l,06
3.36
7.78
9.49
I l.2a
la.4T
55
24
,Q7
5.09
20.s2
d. Do you reject
your null hypothesis?
e. Based
on your conclusions,
predict
you score 160 progeny.
Tt/4
u.,l,k