You examine a population of snapdragons in which flower color is controlled by s
ID: 178850 • Letter: Y
Question
You examine a population of snapdragons in which flower color is controlled by single gene with two alleles (R/r) that demonstrate incomplete dominance. You count 120 plant with white flowers, 370 with pink flowers, 510 with red flowers. What are the frequencies of the "R" and "r" alleles in this population? The Hardy-Weinberg equation is shown at the right. p^2 + 2pq + q^2 = 1 p + q = 1 What do each of the following represent. What does "1" represent in these equations? You examine a trait controlled by a single gene with two alleles that display complete dominance (A/a) In one population the allele frequencies are A = 0.3, a = 0.7. How frequently do you expect to see: Homozygous dominant individuals: Homozygous recessive individuals: Heterozygous individuals: In another population, 1696 of the individuals show the recessive phenotype. i) What is the expected frequency of the recessive allele? ii) How many individuals do you expect to be heterozygous?Explanation / Answer
1,
Bu using gen count method
WHITE
PINK
RED
rr
Rr
RR
120
370
510
0.120
0.370
0.510
Frequency of R—DOMINANT --ALLELE= D +H/2
=0.510 + (0.370/2=0. 0.695-------------------answer
===================================================
Frequency of r—recessive --ALLELE= R +H/2
=0.120 + (0.370/2=0.305-------------------answer
========================================================
Question3
phenotype
genotype
frequenices
frequenices
Homozygous dominant
AA
P^2
.3 x.3=.009
hterozygotes
Aa
2pq
2 x .3 x.7=0.42
Homozygous recessive
aa
q^2
.7 x.7=0.49
=====================================
B
q^2 =16%
q=.4
p+q=1
p=.6
hterozygotes
Aa
2pq
2 x .4 x.6=0.48
Answer =48%-------------------answer
WHITE
PINK
RED
rr
Rr
RR
120
370
510
0.120
0.370
0.510
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