Name_________________________________________________Date____________Period______
PATTERNS OF HEREDITY
In the space at the left, write the letter that best answers the question.
_____1. Type of inheritance shown when a red-flowering plant is crossed with a white flowering
plant and only pink-flowering plants are produced.
a. Inbreeding
c. polygenic inheritance
b. Incomplete dominance
d. codominance
_____2. Trait controlled by four alleles.
a. homologous alleles
b. autosomes
c. hybridization
d. multiple alleles
_____3. The 23rd pair of chromosomes, different in males and females is called _____.
a. autosomes
c. multiple alleles
b. sex chromosomes
d. polygenes
_____4. If a females fruit fly heterozygote for red eyes is crossed with a white eyed male, what
percentage of the offspring would have white eyes?
a. o%
b. 25%
c. 50%
d. 75%
_____5. A cross between a red-flowering snapdragon plant and a white-flowering snapdragon plant
results in 100% pink-flowering plants. When two of these pink-flowering plants are crossed,
the probable phenotypic ration obtained in their offspring would be….
a. 100% pink
c. 75% pink, 25% white
b. 75% red, 25% white
d. 25% red, 50% pink, 25% white
_____6. Because the gene for red-green colorblindness is located on the X chromosome, it is NOT
normally possible for a _____.
a. carrier mother to pass the gene on to her daughter
b. carrier mother to pass on the gene on to her son
c. colorblind father to pass on the gene on to his daughter
d. colorblind father to pass on the gene on to his son
_____7. In pea plants, inflated pods (R) are dominant to constricted pods ( r ). Which of the following
crosses represents a testcross?
a. RR x RR
b. RR x Rr
c. RR x rr
d. Rr x Rr
_____8. In humans, long eyelashes are dominant (L). Short eyelashes are recessive. What is the probable
phenotypic ratio if two heterozygous individuals for short and long eyelashes are married?
a. 100% long eyelashes
c. 75% long, 25% short
b. 75% short, 25% long
d. 100% short
_____9. The result from crossing a white rooster and a black hen is 100% blue Andalusian offspring. When
two of these blue offspring are crossed, the probable phenotypic ratio of their offspring would be...
a. 100% blue
c. 75% blue, 25% white
b. 75% black, 25% white
d. 25% black, 50% blue, 25% white
In the space at the left, write the term that best completes the definition. Select the terms from the list
provided.
Incomplete dominance
Hybrids
Pedigree
codominant alleles
testcross
autosomes
Inbreeding
polygenic inheritance
sex-linked traits
________________________10. Traits controlled by genes located on the X or Y chromosome.
________________________11. Humans have 22 pairs of these types of chromosomes.
________________________12. Is a graphic representation of an individual’s family tree.
________________________13. Inheritance pattern of a trait controlled by two or more genes.
________________________14. The mating of an individual of unknown genotype with one that is
homozygous recessive, in order to determine the unknown genotype.
________________________15. The mating of two very closely related individuals.
________________________16. The phenotype of the heterozygote is intermediate between those
phenotypes express by the homozygotes.
________________________17. These individuals are the result of crossing two varieties or closely
related species.
________________________18. In this type of inheritance both alleles are expressed equally.
In the space at the left, write TRUE if the statement is true; if the statement is false, change the underlined
word or phrase to make it true.
_______________________19. Carriers produced by crossing two purebred plants are often larger and
stronger than their parents.
_______________________20. Purebred is mating between closely related individuals.
______________________21. You have benefited from selective breeding by having more agricultural
products than would have been possible otherwise.
_____________________22. In some species of sheep, the males have much heavier and more coiled horns
than ewes. The probable cause of this difference is external environmental
influences on gene expression.
I
homozygous recessive
II
1
III
The pedigree chart in figure 14-1 shows the incidence of hemophilia over three generations of a
family.
_____23. Individuals II-1 and II-4 in the pedigree chart can be classified as:
a. Homozygous dominant
c. homozygous recessive
b. Mutants
d. carriers
_____24. What is the relationship between individual I-1 and individual III-2?
a. Grandfather-granddaughter
c. great aunt-nephew
b. Grandmother-grandson
d. mother-son
_____25. If individual III-2 marries a person with the same genotype as individual I-1, what is the chance
that one of their children will be born with hemophilia?
a. 0%
b. 25%
c. 50%
d. 75%
_____26. What type of inheritance pattern is represented by the shaded symbols?
a. incomplete dominance
c. codominace
b. multiple alleles
d. sex-linked traits
Answer the following question.
27. The gene for nearsightedness in humans is found on the X chromosome. A boy has a nearsighted father.
Can the boy be nearsighted? Explain your answer.
From the list of terms, select the term that does not belong in the list. Explain your choice.
28. Autosome, X and Y chromosome, sex-linked traits, sex chromosomes.
29. Genotype, phenotype, heterozygous, homozygous.
30. Heterozygous, hybrid, carrier, homozygous.