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Unit 8e-8g Study Guide
8e. Incomplete Dominance
1. Given a written scenario, be able to determine that it is describing this type of inheritance.
2. All three possible genotypes produce unique phenotypes.
a. Homozygous dominant produces ______________________ trait.
b. Homozygous recessive produces ______________________ trait.
c. Heterozygous produces ______________________ trait.
3. Be able to do a Punnett square describing the phenotype and genotype of the offspring and/or
parents. (See word problems later in document for practice)
8f. Codominance
1. Given a written scenario, be able to determine that it is describing this type of inheritance.
2. All three possible genotypes produce unique phenotypes.
a. Homozygous dominant produces ______________________ trait.
b. Homozygous recessive produces ______________________ trait.
c. Heterozygous produces ______________________ trait.
3. Know blood type genotypes and phenotypes, and how to work with them in a Punnett Square.
Genotype Phenotype Can donate
to
Can accept
from
A IAIA, IAi
B B blood type B & AB B & O
AB A, B, AB & O
O ii O blood type A, B, AB & O
4. Be able to do a Punnett square describing the phenotype and genotype of the offspring and/or
parents. (See word problems later in document for practice)
# Alex
dominant BB
resessive tab
in between Bb
Dominant BB
# Yn dominant how
combined BW
IBI 78199
am ppp.mx 8g. Hardy-Weinberg Equilibrium
1. What ar e the fi ve assumptions of the Har dy-Weinber g equilibrium?
a.
b.
c.
d.
e.
2. Kno w the tw o equations used in the Har dy-Weinber g equilibrium.
a. Which is used for describing abundance of genotypes in a population?
b. Which is used for describing abundance of alleles in a population?
3. Be able to wor k thr oug h calculations of allele and genotype fr equencies for populations in
Har dy-Weinber g equilibrium. (See word problems later in document for practice)
Genetic Word Problems
8e. Incomplete Dominance
1. Yellow guinea pigs, Y, are crossed with white guinea pigs, y, and only produce cream colored
guinea pigs. How is this possible?
2. Two pink snap dragons are crossed and produce 25 red, 50 pink, and 25 white in the F1
generation. Show the genotypes and phenotypes of the P generations.
No mutations
## unperedict mating
## Large population
## No natran selection
## No migration
## P2 2pq 7921
# ptq. ly
x
## Yellow Y
# White yy
# 1 cream in
R r
## Rr pink
## R Rtf RR red
Rr rr rr white 3. The color of a bears coat follows incomplete dominance. If a black color coat is dominant,
what would the offspring of a black coated bear and a white coated bear look like? Include the
probability of each genotype and list the phenotype associated with the genotype.
8f. Codominance
1. A couple has 4 children, each with a different blood type: one with type A, one with type B, one
with type AB and one with type O. Is this possible? What are the genotypes of the parents?
2. A women has blood type A and has a child with blood type O. Why could the father not have the
blood type AB?
3. A red fish (FF) is mated with a blue fish (ff), their offspring are red with blue spots. Your friend
now says that all the fish that are produced by these red with blue spotted fish will all be red
with blue spots. Draw a Punnett square to determine if your friend is correct. What are the
genotypes and phenotypes of the fish that would result from this cross.
W A IAIA IA IA IB IAIB
## B 0 ii
pass AB IAIB.EE EIfIEf Eff 8g. Hardy-Weinberg Equilibrium
1. In a population of rabbits found to be in Hardy-Weinberg Equilibrium, the allele for black fur
(B) is dominant over the allele for white fur (b). If the frequency of the black fur allele (B) is 0.7,
what is the frequency of the white fur allele (b)?
2. In a fish population, 16% of individuals are homozygous dominant (GG) for green scales, and
36% are homozygous recessive (gg) for blue scales. What is the frequency of heterozygous
individuals in this population?
3. In a herd of cows found to be in Hardy-Weinberg Equilibrium, 84% have black spots (dominant
trait) and 16% have white spots (recessive trait).
a. What is the frequency of the white allele (w)?
b. What is the frequency of the black allele (W)?
# p _dom D 0.7
## q rec all b