Biology Chapters 9 And 12

19 Questions | Total Attempts: 62

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Biology Quizzes & Trivia

Questions and Answers
  • 1. 
    Mendel obtained plants that were true- breeding for particular traits by
    • A. 

      Growing plants from the seeds of others plants that showed that trait

    • B. 

      Discarding plants that showed others traits

    • C. 

      Allowing plants to self- pollinate for several generations

    • D. 

      Allowing plants to cross- pollinate for one generation

  • 2. 
    When Mendel crossed a strain of tall pea plants with a strain of short pea plants, he observed that all of the plants in the F1 generation were tall. This suggests that
    • A. 

      The tall trait was controlled by a dominant factor

    • B. 

      The short trait was controlled by a dominant factor

    • C. 

      Both traits were controlled by a recessive factor

    • D. 

      The strain of short plants was not capable of pollinating the strain of tall plants

  • 3. 
    A cross between true- breeding green- podded pea plants and true- breeding yellow- podded pea plants produces only green- podded plants. When the F1 generation is allowed to self pollinate, the F2 generation consists of
    • A. 

      Only green- podded plants

    • B. 

      Only yellow- podded plants

    • C. 

      About three quarters yellow- podded plants and one quarter green podded plants

    • D. 

      About three quarters green- podded plants and one quarter yellow- podded plants

  • 4. 
    When alleles for different characteristics are one separate chromosomes, they are distributed to gametes independently. This obersvation is summarized by the law of
    • A. 

      Cross- pollination

    • B. 

      Independent assortment

    • C. 

      Segregation

    • D. 

      Molecular genetics

  • 5. 
    The appearance of an organism is its
    • A. 

      Genotype

    • B. 

      Phenotype

    • C. 

      Genotypic ratio

    • D. 

      Phenotypic ratio

  • 6. 
    A genetic crossed performed many times produces 798 long- stemmed plants amd 266 short- stemmed plants. The probability of obtaining a short- stemmed plant in a similar cross is
    • A. 

      266/ 1, 064.

    • B. 

      266/ 798

    • C. 

      798/ 266

    • D. 

      798/ 1, 064.

  • 7. 
    A monohybrid cross of two individuals that are heterozygous for a trait exhibiting complete dominance would probably result in a phenotypic ratio of
    • A. 

      4 dominant: 0 recessive

    • B. 

      1 dominant: 3 recessive

    • C. 

      3 dominant: 1 recessive

    • D. 

      1 dominant: 1 recessive

  • 8. 
    To determine the genotype of an individual that shows the dominant phenotype, you would cross that individual with one that is
    • A. 

      Heterozygous dominant

    • B. 

      Heterozygous recessive

    • C. 

      Homozygous dominant

    • D. 

      Homozygous recessive

  • 9. 
    In a dihybrid cross between an individual with the genotype RRYY and an individual with the genotype rryy, all of the offspring will have the genotype
    • A. 

      RRYY

    • B. 

      RrYY

    • C. 

      RrYy

    • D. 

      Rryy

  • 10. 
    Genes that belong to the same linkage group tend to be
    • A. 

      Located on different chromosomes

    • B. 

      Inherited together

    • C. 

      Found only in males

    • D. 

      Found only in somatic cells

  • 11. 
    Two genes that are one map unit apart are separated by crossing- over
    • A. 

      1% of the time

    • B. 

      20% of the time

    • C. 

      50% of the time

    • D. 

      100% of the time

  • 12. 
    Mutations that can be inherited arise in
    • A. 

      Somatic cells

    • B. 

      Body cells

    • C. 

      Germ cells

    • D. 

      Skin cells

  • 13. 
    Which of the following sequences could result from an inversion of the sequence GAGACATT?
    • A. 

      GAGCATT

    • B. 

      GTGACATT

    • C. 

      CTCTGATT

    • D. 

      GATACAGT

  • 14. 
    Which of the following is a point mutation that does not produce a frameshift?
    • A. 

      Substitution

    • B. 

      Insertion

    • C. 

      Deletion

    • D. 

      Inversion

  • 15. 
    Which individual (s) in the pedigree shown below must be a carrier?
    • A. 

      1 only

    • B. 

      4 only

    • C. 

      3 only

    • D. 

      Both 1 and 4

  • 16. 
    Since the ABO blood group alleles are codominant, an individual with the genotype IAIB will have blood type
    • A. 

      A

    • B. 

      B

    • C. 

      AB

    • D. 

      O

  • 17. 
    Which of the following human traits is not a polygenic trait?
    • A. 

      Skin color

    • B. 

      Eye color

    • C. 

      Height

    • D. 

      ABO blood type

  • 18. 
    A trait whose expression is affected by the presence of sex hormones is said to be
    • A. 

      Sex- influenced

    • B. 

      Sex- linked

    • C. 

      X- linked

    • D. 

      Y- linked

  • 19. 
    In humans, PKU can be treated by
    • A. 

      Insulin injections

    • B. 

      Diet

    • C. 

      Gene therapy

    • D. 

      Surgery

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