Download Genetics Sub Work_Types of Inheritance

Name:_____________________
OBJ. 3.2.2
Genetics Review Practice
Complete Dominance
1) In humans, tongue rolling is a dominant trait; individuals with the recessive condition cannot roll their
tongues. Bob can roll his tongue, but his mother could not. He is married to Sally, who cannot roll her
tongue. What is the probability that their first born child will not be able to roll his tongue?
Phenotypes:
Genotypes:
______ _______ ______
Genotypes (Letters):
Parents: __________ x __________
Phenotypes:
__________ ___________
2) In goats, a recessive gene causes the goats to "faint" when they are startled. A farmer breeds two goats
(that have never fainted) and their first offspring faints two days after its birth. What must the parent's
genotypes have been? Show the cross to prove it.
Phenotypes:
Genotypes:
______ _______ ______
Genotypes (Letters):
Parents: __________ x __________
Phenotypes:
__________ ___________
Incomplete Dominance
1) In primroses red and white flowers can have offspring that are pink. What are the phenotypic ratios of a
cross between a red and a pink flower?
Phenotypes:
Genotypes:
______ _______ ______
Genotypes (Letters):
Parents: __________ x __________
Phenotypes:
_______ _______ _______
2) In Vicxies, a blue toed male mates with a yellow toed female and they produce green toed offspring.
Draw a Punnett square to show this cross. Provide the phenotypic and genotypic ratios of this cross.
Phenotypes:
Genotypes:
______ _______ ______
Genotypes (Letters):
Parents: __________ x __________
Phenotypes:
_______ _______ _______
3) If a green toed female produced 50% green toed offspring and 50% yellow toed offspring, what is the
genotype and phenotype of the male parent?
Phenotypes:
Genotypes (Letters):
Parents: __________ x __________
Genotypes:
______ _______ ______
Phenotypes:
_______ _______ _______
4) In snapdragons, the combined expression of both alleles for flower color produces a new phenotype
that is pink. This illustrates incomplete dominance. The white(R) and red (R’) snapdragons are
homozygous. Show the offspring of a cross between two heterozygous pink snapdragons?
Phenotypes:
Genotypes:
______ _______ ______
Genotypes (Letters):
Parents: __________ x __________
Phenotypes:
_______ _______ _______
Codominance
1) Black feathers (B) is co-dominant to white feathers (W). If a bird with black feathers and a bird with
black-and-white feathers mate, what percentage of their offspring will be black?
Phenotypes:
Genotypes:
______ _______ ______
Genotypes (Letters):
Parents: __________ x __________
Phenotypes:
_______ _______ _______
2) Some cats exhibit a co-dominant trait. They can have brown spots, black spots, or both black and
brown spots. What type of offspring would result if a brown spotted cat mated with a black and brown
spotted cat?
Phenotypes:
Genotypes:
______ _______ ______
Genotypes (Letters):
Parents: __________ x __________
Phenotypes:
_______ _______ _______
3) In birds, Black and Red feathers are co-dominant. Cross two black and red birds. What is the probability
that these two birds will have all black offspring?
Phenotypes:
Genotypes:
______ _______ ______
Genotypes (Letters):
Parents: __________ x __________
Phenotypes:
_______ _______ _______
4) When roan (spotted) cattle are crossed, 25% of the offspring produced will have white coats, 50% will
have roan coats, and 25% will have red coats.
Phenotypes:
Genotypes:
______ _______ ______
Genotypes (Letters):
Parents: __________ x __________
Phenotypes:
_______ _______ _______
a. What type of inheritance pattern do these results illustrate?
b. What are the genotypes and phenotypes of the parents that produced these offspring?
5) Coat color in cats is a codominant trait and is also located on the X chromosome. Cats can be black,
yellow or calico. A calico cat has black and yellow splotches. In order to be calico. The cat must have an
allele for the black color and an allele for the yellow color. Use a Punnet square to show why there are no
male calico cats.
Phenotypes:
Genotypes:
______ _______ ______
Genotypes (Letters):
Parents: __________ x __________
Phenotypes:
_______ _______ _______
Blood Types: SHOW ALL WORK!! Create your own Punnet Squares, Show Genotypes/Phenotypes, Parents AND the
Genotype and Phenotype Ration Charts FOR ALL PROBLEMS!!
6) A heterozygous woman with blood type A is married to a man with blood type O. What are the
genotypes and phenotypes of the offspring?
Phenotype (Blood Type)
Genotype
Blood Type A
AA or AO
Blood Type B
BB or BO
Blood Type AB
AB
Blood Type O
OO
7) A couple has four children. They have 2 girls with type AB blood, one girl with type B, and one boy with
type B blood. The mother knows she is homozygous type B. What is the father’s genotype?
8) A parent with Type AB blood and a parent with Type O blood have a child. What are the possible
genotype of their offspring?
Sex-Linked Traits SHOW ALL WORK!! Create your own Punnet Squares, Show Genotypes/Phenotypes, Parents AND
the Genotype and Phenotype Ration Charts FOR ALL PROBLEMS!!
1) In humans, colorblindness is a sex-linked trait. This means that the alleles for the gene are carried on the Xchromosome. Rolando is a male that is colorblind and his wife is a carrier. Rolando wants to find out the
probability of his children being colorblind.
2) In humans Hemophilia is a sex-linked recessive disorder. What is the probability of a normal male and a
female that has Hemophilia having children with Hemophilia?
3) A man who is colorblind marries a woman who is not colorblind but carries the gene for colorblindness.
What are their chances of having a colorblind son?
Karyotyping
1) A couple has recently had a baby. The karyotype to the right
was taken from their child.
- Does the child have a genetic disorder? _______
- If so, what is this genetic disorder? _________________
- Is the child a male or female? _______________
- How did you know? _____________________________________
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