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Chapter 14: Mendel and the Gene Idea
 
Pre-Test
 

Pre-Test


1 .       In his breeding experiments, Mendel first crossed true-breeding _____ generation plants to produce the _____ generation, which were then allowed to self-pollinate to generate the _____ offspring. (Concept 14.1E-Book) [Hint]

 P ... F1 ... F2
 F ... P1 ... P2
 P1 ... P2 ... F
 P1 ... P2 ... P3
 F1 ... F2 ... F3
2 .       A plant with the genotype AABbcc _____. (Concept 14.1E-Book) [Hint]

 is homozygous at two loci
 is heterozygous at two loci
 has recessive alleles at three loci
 is triploid
 all of the above
3 .       An allele is _____. (Concept 14.1E-Book) [Hint]

 a type of chromosome
 the dominant form of a gene
 a variety of pea plant used by Mendel
 an alternative version of a gene
 the recessive form of a gene
4 .       GgTt pea plants can produce _____ type(s) of gametes, but a ggtt plant can produce _____ type(s) of gametes. (Concept 14.2E-Book) [Hint]

 one ... two
 two... one
 four ... two
 four ... one
 one ... one
5 .       Two organisms with genotype AaBbCcDdEE mate. These loci are all independent. What fraction of the offspring will have the same genotype as the parents? (Concept 14.2E-Book) [Hint]

 3/4
 1/4
 9/64
 1/16
 4/3
6 .       You cross a true-breeding red-flowered snapdragon with a true-breeding white-flowered one. All of the F1 are pink. What does this say about the alleles for the parental traits? (Concept 14.3E-Book) [Hint]

 Red and white are codominant.
 Red is completely dominant.
 Both red and white are pleiotropic.
 Red shows incomplete dominance over white.
 Pink is dominant, while red and white are recessive.
7 .       All of the following represent possible types of interactions between alleles except _____. (Concept 14.3E-Book) [Hint]

 complete dominance
 codominance
 incomplete dominance
 epistasis
 none of the above
8 .       Folk singer Woody Guthrie died of Huntington's disease, an autosomal dominant disorder. Which statement below must be true? (Concept 14.4E-Book) [Hint]

 All of his children will develop Huntington's disease.
 His sons will develop Huntington's disease but not his daughters.
 His daughters will die of Huntington's disease but not his sons.
 At least one of Woody Guthrie's parents must also have had the allele for Huntington's disease.
 There is not enough information to answer the question.
9 .       Various procedures can be used to detect genetic disorders before birth. Among the tests discussed in this chapter, _____ is the least invasive, while _____ and _____ allow the chromosomes of the fetus to be examined. (Concept 14.4E-Book) [Hint]

 amniocentesis ... fetoscopy ... chorionic villus sampling
 ultrasound imaging ... chorionic villus sampling ... amniocentesis
 ultrasound imaging ... fetoscopy... amniocentesis
 amniocentesis ... ultrasound imaging ... chorionic villus sampling
 chorionic villus sampling ... fetoscopy ... amniocentesis
10 .       If an individual is heterozygous for the sickle-cell trait _____. (Concept 14.4E-Book) [Hint]

 he or she will show no symptoms of the disease because the allele that causes sickle-cell disease is recessive
 he or she will have full-blown sickle-cell disease because the allele is dominant
 he or she will be more apt to acquire a serious case of malaria
 he or she will not develop full-blown sickle-cell disease but may show symptoms under certain circumstances
 none of the above







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