A new kind of tulip is produced that develops only purple or pink flowers. Assum
ID: 11451 • Letter: A
Question
A new kind of tulip is produced that develops only purple or pink flowers. Assume that flower color is controlled by a single gene locus, and that the purple allele (C) is dominant to the pink allele (c). A random sample of 1000 tulips from a large cultivated field yields 786 purple flowers, and 214 pink flowers. Of the purple flowers 157 are determined to be heterozygous.a) Determine the frequency of the purple and pink alleles in this field population.
b) Estimate the expected number of individuals in a population that is in Hardy-Weinberg equilibrium.
c) Is this population in H-W equilibrium? How do you know? Suggest some possible explanations for this result.
d) Because real-life populations are, of course, not infinitely large, why is the Hardy-Weinberg condition of an “infinitely large population” usually met for natural populations?
Explanation / Answer
the purple allele (C) is dominant to the pink allele (c).
CC------------ purple allele; cc-------- pink allele
CC Cc cc
786 purple flowers, and 214 pink flowers.=1000
CC
Cc
cc
629/1000
157
214/1000
.629
.157
.214
a) Determine the frequency of the purple and pink alleles in this field population.
frequency of the purple allele=D+H/2 = .629+ .157/2= 0.629 +0.0785 =0.7075
frequency of the pink allele= R+H/2 = .214 + .157/2= .214 +0.0785 =0.2925
b) Estimate the expected number of individuals in a population that is in Hardy-Weinberg equilibrium.
Expected fre
expected number of individuals
CC
P2
0.7075 X 0.7075
.50055
500
Cc
2PQ
2 X 0.7075 X0.2925
0.4138
413
cc
Q2
0.2925 X0.2925
0.8561
87
c) Is this population in H-W equilibrium? How do you know? Suggest some possible explanations for this result.
There is devoation in observed and expected frequencies , so the populaton is not in HARDY EINBERG EUILIBRIUM
CC
Cc
cc
629/1000
157
214/1000
.629
.157
.214
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