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11 Introduction to Genetics
Date
Chapter Test B
Multiple Choice
Write the letter that best answers the question or completes the statement on the line provided.
_____ 1. A mule is the result of a cross between a donkey and a horse. A mule is a
a. tetrad.
c. genotype.
b. phenotype.
d. hybrid.
_____ 2. A tall plant (TT) is crossed with a short plant (tt). If the tall F1 pea plants are allowed to selfpollinate,
a. the offspring will be of medium height.
b. all of the offspring will be tall.
c. all of the offspring will be short.
d. the offspring can be tall or short.
_____ 3. The principles of probability can be used to
a. predict the traits of the off spring of genetic crosses.
b. determine the actual outcomes of genetic crosses.
c. determine which species should be used in genetic crosses.
d. decide which organisms are best to use in genetic crosses.
_____ 4. A heterozygous tall pea plant is crossed with a short plant. The probability that an F1 plant
will be tall is
a. 25%.
c. 75%.
b. 50%.
d. 100%.
_____ 5. Organisms that have two identical alleles for a particular trait are said to be
a. hybrid.
c. heterozygous.
b. homozygous.
d. dominant.
_____ 6. What principle states that during gamete formation genes for different traits separate without
influencing each other’s inheritance?
a. principle of dominance
b. principle of independent assortment
c. principle of probabilities
d. principle of segregation
_____ 7. Why did Thomas Hunt Morgan use fruit flies in his studies?
a. Fruit flies produce a large number of offspring.
b. Fruit flies take a long time to produce offspring.
c. Fruit flies share certain characteristics with pea plants.
d. Fruit flies have a long life span.
_____ 8. Variation in human skin color is an example of
a. incomplete dominance.
c. polygenic traits.
b. codominance.
d. multiple alleles.
_____ 9. If an organism’s diploid number is 12, its haploid number is
a. 12.
c. 24.
b. 6.
d. 3.
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_____ 10. Gametes are produced by the process of
a. mitosis.
c. crossing-over.
b. meiosis.
d. replication.
Figure 11–1
_____ 11. What is shown in Figure 11–1?
a. independent assortment
b. anaphase I of meiosis
c. crossing-over
d. replication
_____ 12. Unlike mitosis, meiosis results in the formation of
a. diploid cells.
c. 2N daughter cells.
b. haploid cells.
d. body cells.
_____ 13. What is formed at the end of meiosis?
a. two genetically identical cells c. four genetically identical cells
b. four genetically different cells d. two genetically different cells
_____ 14. Linked genes
a. are never separated.
b. assort independently
c. are on the same chromosome.
d. are always recessive.
_____ 15. The farther apart two genes are located on a chromosome, the
a. less likely they are to be inherited together.
b. more likely they are to be linked.
c. less likely they are to assort independently
d. less likely they are to be separated by crossing over.
Modified True/False
Indicate whether the statement is true or false. If false, change the underlined word or phrase to make
the statement true.
_____ 16. The probability that a gamete produced by a pea plant heterozygous for stem height (Tt)
will contain the recessive allele is 100%.
_____ 17. A trait in an unidentified plant is controlled by one gene that has two alleles. One allele is
dominant over the other. According to Mendel’s principles, one fourth of the off spring
made from a cross between two heterozygous plants will show the recessive trait.
_____ 18. Coat color in rabbits is determined by a single gene that has multiple alleles.
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