Biology 101 Chapters 15 Thru 19

18 Questions
Biology 101 Chapters 15 Thru 19

Chromosomal basis of inheritance, DNA from Gene to Protein, genetics of viruses and bacteria

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Questions and Answers
  • 1. 
    The chromosome theory of inheritance states that _____.
    • A. 

      Genes occupy specific positions on chromosomes

    • B. 

      Homologous chromosomes segregate from each other during meiosis

    • C. 

      Chromosomes assort independently during meiosis

    • D. 

      All of the above

  • 2. 
    If two genes are linked, _____.
    • A. 

      They are on different chromosomes

    • B. 

      They assort independently

    • C. 

      They code for the same protein

    • D. 

      They are on the same chromosome

    • E. 

      They are on sex chromosomes

  • 3. 
    What is the probability that a male will inherit an X-linked recessive allele from his father?
    • A. 

      10%

    • B. 

      25%

    • C. 

      50%

    • D. 

      100%

    • E. 

      0%

  • 4. 
    In an X-linked, or sex-linked, trait, it is the contribution of _____ that determines whether a son will display the trait.
    • A. 

      The father

    • B. 

      The mother

    • C. 

      The grandmother

    • D. 

      The grandfather

    • E. 

      The brother or sister

  • 5. 
    If a mother is heterozygous for a recessive sex-linked trait and her husband has the dominant allele, which one of the following is true about the probabilities for their children?
    • A. 

      Half of their sons will have the recessive trait.

    • B. 

      0% of their sons will have the recessive trait.

    • C. 

      25% of their sons will have the recessive trait.

    • D. 

      75% of their sons will have the recessive trait.

    • E. 

      100% of their sons will have the recessive trait.

  • 6. 
    A woman is a carrier for red-green color blindness, a sex-linked trait. Her husband is normal (not color-blind) for this trait. What are the chances that their newborn daughter will be red-green color-blind?
    • A. 

      0%

    • B. 

      25%

    • C. 

      50%

    • D. 

      75%

    • E. 

      100%

  • 7. 
    Cells that have more than two complete sets of chromosomes are termed _____.
    • A. 

      Diploid

    • B. 

      Haploid

    • C. 

      Polyploid

    • D. 

      Gametes

    • E. 

      Chromosomal abnormalities

  • 8. 
    Which one of the following is the only known viable human monosomy?
    • A. 

      XO

    • B. 

      YO

    • C. 

      XXY

    • D. 

      XYY

    • E. 

      XXX

  • 9. 
    It is proposed that a certain disorder affecting the inner ear is caused by mitochondrial DNA. Which of the following observations would be the most decisive evidence against this idea?
    • A. 

      The precise cause of the disorder is found to involve the nervous system.

    • B. 

      Mothers pass the disorder on to their offspring, but fathers do not.

    • C. 

      Females and males have the disorder in equal numbers.

    • D. 

      Females with the disorder pass it to all their children, but males only pass it to half their offspring.

    • E. 

      Fathers with the disorder pass it on to all their children, but mothers with the disorder do not pass it along.

  • 10. 
    A color-blind woman mates with a male with normal color vision. Which of these results would indicate that color blindness is caused by an X-linked recessive allele?
    • A. 

      Half of the sons and half of the daughters are color-blind.

    • B. 

      All of the daughters, and none of the sons, are color-blind.

    • C. 

      All of the sons, and none of the daughters, are color-blind.

    • D. 

      The offspring occur in a ratio of 3 color-blind : 1 normal vision.

    • E. 

      The offspring occur in a ratio of 9 normal vision males : 3 color-blind vision males : 3 normal vision females : 1 color-blind female.

  • 11. 
    Color blindness is an X-linked recessive trait. A color-blind man has a daughter with normal color vision. What is the genotype of the daughter?
    • A. 

      XCXc

    • B. 

      XCXC

    • C. 

      XcXc

    • D. 

      XCY

    • E. 

      XcY

  • 12. 
    Color blindness is an X-linked recessive trait. Under what conditions can an unaffected male have a color-blind daughter?
    • A. 

      He is heterozygous for color vision.

    • B. 

      His mate is color-blind.

    • C. 

      His father is color-blind.

    • D. 

      His mother is color-blind.

    • E. 

      He can't.

  • 13. 
    Humans are diploid and have 46 chromosomes (or two sets). How many sets of chromosomes are found in each human gamete?
    • A. 

      1

    • B. 

      2

    • C. 

      3

    • D. 

      4

    • E. 

      5

  • 14. 
    Humans are diploid and have 46 chromosomes. How many chromosomes are found in each human gamete?
    • A. 

      12

    • B. 

      23

    • C. 

      46

    • D. 

      92

    • E. 

      6

  • 15. 
    _____ is the process by which haploid gametes form a diploid zygote.
    • A. 

      Embryogenesis

    • B. 

      Fertilization

    • C. 

      Meitosis

    • D. 

      Gastrulation

    • E. 

      Mitosis

  • 16. 
    Which of these terms applies to an organism with extra sets of chromosomes?
    • A. 

      Monosomy

    • B. 

      Haploid

    • C. 

      Diploid

    • D. 

      Trisomy

    • E. 

      Polyploid

  • 17. 
    Give an example of monosomy.
  • 18. 
    Give an example of trisomy.