Name______
Review:
- Define the following list of terms:
Genetics (Chapters 9 and 12):
Codominance
Incomplete Dominance
Multiple Allelic Inheritance
Sex-linked Inheritance
Testcross
Recessive Trait
Dominant Trait
Rule of unit factors
Rule of dominance
Homozygous
Heterozygous
Heredity
Trait
Phenotype
Genotype
allele
Law of segregation
Law of independent assortment
Gregor Mendel
Pedigree
Genetic Engineering:
Restriction Enzymes
PCR
Gene Therapy
Recombinant DNA
Gel electrophoresis
- Use to create a crossword puzzle.
Switch with other members of the class and try to solve their puzzles.
C. DO EACH OF THE PROBLEMS ON A LINED PIECE OF PAPER IN YOUR NOTEBOOK.
1. In man, normal pigmentation is dominant over albinism, which is a condition in which a person’s skin, hair and eyes have very little pigment. A normal heterozygous man marries a homozygous albino woman.
A) Assign a letter to represent the albino gene and a letter to represent the normal gene.
B) Write the genotypes of the man and the woman.
C) Show a cross of the two using a punnett square.
D) What is the F1genotypic ratio?
E) What is the F1 phenotypic ratio?
F) What is the chance that they could have an albino offspring?
2. In some plants, tall is dominant over dwarf .A homozygous tall plant is crossed with a short plant.
A) Assign a letter to represent the tall gene, and a letter to represent the dwarf gene.
B) Write the genotypes of both parental plants.
C) Cross the two using a punnett square.
D) Write the F1 genotypic ratio.
E) write the F1 phenotypic ratio.
3. In man, brown eyes are dominant over blue eyes. A brown-eyed man marries a blue-eyed woman and one of their children has blue eyes.
A) Assign a letter to represent the brown eye gene and the blue eye gene.
B) What are the genotypes of the parents?
C) What is the genotype of their blue-eyed child?
D) Cross the parents using a punnett square.
E) Write the F1 phenotypic and genotypic ratios.
4. Round pea seeds are dominant over wrinkled pea seeds.
A)Cross a pea plant heterozygous for round seeds with a pea plant with wrinkled seeds using a
Punnett square.
B) Show the F1 phenotypic and genotypic ratios.
C) What fraction of their offspring would you expect to have wrinkled seeds?
5. In beagles, black coats are dominant over brown.
A) Cross a homozygous black beagle with a brown one and write the F1 phenotypic and genotypic ratio.
B) Cross the F1 using a Punnett square and write the F2 phenotypic and genotypic ratios.
6. A chicken which is homozygous for black feathers (B) is bred with a chicken which is homozygous for white feathers (W). ALL of their offspring has gray feathers. This is called codominance.
A) What is the genotype of a gray chicken?
B) Cross two gray chickens using a Punnett square.
B)What is the F1 phenotypic and genotypic ratio?
7. Guinea pigs are codominant for coat color. A brown pig is BB, a white pig is WW, and a brown and white pig is BW.
A) Cross a brown pig and a white pig using a Punnett square and show the F1 phenotypic and genotypic ratios of the F1 generation.
B) Cross two F1 pigs using a Punnett square and write the F2 phenotypic and genotypic ratios.
8. If a person with Blood type AB mates with a person with type A blood, one of their children ends up with type B blood
A) What are the phenotypes of the two parents?
B) Cross the two using a Punnett square.
C)What is the genotype of their type B offspring?
D)What is the probability that their next child would have type A?
9. The father of a baby has blood type A and the mother has blood type B. Their baby has blood type O.
A) What must the genotypes of the two parents be?
B) Cross the two using a Punnett square.
C) What is the F1 phenotypic and genotypic ratio?
D) What is the probability that they could have a child with type AB blood?
10. Hemophilia is a sex-linked recessive disease.
A) If a male hemophiliac marries a female who is normal but is heterozygous for the trait, what are their phenotypes?
B) Show a cross between the two using a Punnett square.
C) What is the probability that the two would have a hemophilic son? A hemophilic daughter?
11. A male with hemophilia is marries a normal woman with a hemophilic father.
A) What are the genotypes of the man and woman?
B) Cross the two using a Punnett square and write the F1 phenotypic and genotypic ratios.
12. In cats, the genes that control coat color are sex-linked and incompletely dominant. When yellow animals (Y) are crossed with black (B), a tortoise shell (BY) pattern results. A tortoise shell female is bred with a black male.
A) What are their phenotypes?
B) Cross the two using a Punnett square and write the F1 phenotypic and genotypic ratios.