Download SAT 2 week 4 Evolution/Classification File

Week 4 Evolution
Ch 7, approx. p.250
Highlight in review books if you’d like
Homologous vs. analogous structures
bird wing, whale flipper;
Similar evol. origins,
different functions =
divergent evolution
bird & bat wing,;
Similar functions,
different evol. origins =
convergent evolution
Molecular evolution- rate of change in a gene
Hardy-Weinberg Principlemathematical prediction of gene
frequencies in a population
p= frequency of dominant allele
q= frequency of recessive allele
p+q=1
sperm
p
p
q
pp
pq
pq
qq
eggs
q
So, p2 = homozygous dominant
2pq = heterozygous
q2= homozygous recessive
Practice problem:
In a population, the frequency of homozygous curly
hair is 64%. What % of the population has curly hair?
CC or p2 = .64
p= .8
need to add in Cc or pq to the
percent
p + q =1
So, .8 + q = 1
q = .2
then p2 = .64
and 2pq= 2(.8 x .2) =.32
Add them together, .64 + .32 = .96 or 96% have curly hair