Genetics Trivia Questions Test! Toughest Quiz

50 Questions | Total Attempts: 53

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Genetics Trivia Questions Test! Toughest Quiz

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Questions and Answers
  • 1. 
    Offspring that result from crosses between true-breeding parents with different traits
    • A. 

      Are true-breeding.

    • B. 

      Make up the F2 generation.

    • C. 

      Make up the parental generation.

    • D. 

      Are called hybrids

  • 2. 
    The chemical factors that determine traits are called
    • A. 

      Alleles

    • B. 

      Traits

    • C. 

      Genes

    • D. 

      Characters

  • 3. 
    Gregor Mendel concluded that traits are
    • A. 

      Not inherited by offspring.

    • B. 

      Inherited through the passing of factors from parents to offspring.

    • C. 

      Determined by dominant factors only.

    • D. 

      Determined by recessive factors only.

  • 4. 
    When Gregor Mendel crossed a tall plant with a short plant, the F1 plants inherited
    • A. 

      An allele for tallness from each parent.

    • B. 

      An allele for tallness from the tall parent and an allele for shortness from the short parent.

    • C. 

      An allele for shortness from each parent.

    • D. 

      An allele from only the tall parent.

  • 5. 
    The principle of dominance states that
    • A. 

      All alleles are dominant.

    • B. 

      All alleles are recessive.

    • C. 

      Some alleles are dominant and others are recessive.

    • D. 

      Alleles are neither dominant nor recessive.

  • 6. 
    When Gregor Mendel crossed true-breeding tall plants with true-breeding short plants, all the offspring were tall because
    • A. 

      The allele for tall plants is recessive.

    • B. 

      The allele for short plants is dominant.

    • C. 

      The allele for tall plants is dominant.

    • D. 

      They were true-breeding like their parents.

  • 7. 
    A tall plant is crossed with a short plant. If the tall F1 pea plants are allowed to self-pollinate,
    • 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. 

      Some of the offspring will be tall, and some will be short.

  • 8. 
    The principles of probability can be used to
    • A. 

      Predict the traits of the offspring produced by genetic crosses.

    • B. 

      Determine the actual outcomes of genetic crosses.

    • C. 

      Predict the traits of the parents used in genetic crosses.

    • D. 

      Decide which organisms are best to use in genetic crosses.

  • 9. 
    In the P generation, a tall plant is crossed with a short plant. The probability that an F2 plant will be tall is
    • A. 

      50%

    • B. 

      75%

    • C. 

      25%

    • D. 

      100%

  • 10. 
    Organisms that have two identical alleles for a particular trait are said to be
    • A. 

      Hybrid

    • B. 

      Homozygous

    • C. 

      Heterozygous

    • D. 

      Dominant

  • 11. 
    In the Punnett square shown in Figure 11-1, which of the following is true about the offspring resulting from the cross? (Tt x TT)
    • A. 

      About half are expected to be short.

    • B. 

      All are expected to be short.

    • C. 

      About half are expected to be tall.

    • D. 

      All are expected to be tall.

  • 12. 
    The genotypic ratio of the offspring in Figure 11-1 is:
    • A. 

      2TT:2Tt

    • B. 

      1TT:2Tt:1tt

    • C. 

      2tall:2short

    • D. 

      3tall:1short

  • 13. 
    The phenotypic ratio of the offspring in Figure 11-1 is:
    • A. 

      2TT:2Tt

    • B. 

      2tall:2short

    • C. 

      1TT:2Tt:1tt

    • D. 

      4 tall

  • 14. 
    A Punnett square shows all of the following EXCEPT
    • A. 

      All possible results of a genetic cross.

    • B. 

      The genotypes of the offspring.

    • C. 

      The alleles in the gametes of each parent.

    • D. 

      The actual results of a genetic cross.

  • 15. 
    If you made a Punnett square showing Gregor Mendel’s cross between true-breeding tall plants and true-breeding short plants, the square would show that the offspring had
    • A. 

      The genotype of one of the parents.

    • B. 

      A phenotype that was different from that of both parents.

    • C. 

      A genotype that was different from that of both parents.

    • D. 

      The genotype of both parents.

  • 16. 
    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

  • 17. 
    How many different allele combinations would be found in the gametes produced by a pea plant whose genotype was RrYY?
    • A. 

      2

    • B. 

      4

    • C. 

      8

    • D. 

      16

  • 18. 
    If a pea plant that is heterozygous for round, yellow peas (RrYy) is crossed with a pea plant that is homozygous for round peas but heterozygous for yellow peas (RRYy), how many different phenotypes are their offspring expected to show?
    • A. 

      2

    • B. 

      4

    • C. 

      8

    • D. 

      16

  • 19. 
    Situations in which one allele for a gene is not completely dominant over another allele for that gene are called
    • A. 

      Multiple alleles.

    • B. 

      Incomplete dominance.

    • C. 

      Polygenic inheritance.

    • D. 

      Multiple genes.

  • 20. 
    A cross of a red cow (RR) with a white bull (WW) produces all roan offspring (RRWW). This type of inheritance is known as
    • A. 

      Incomplete dominance.

    • B. 

      Polygenic inheritance.

    • C. 

      Codominance.

    • D. 

      Multiple alleles.

  • 21. 
    The number of chromosomes in a gamete is represented by the symbol
    • A. 

      Z

    • B. 

      X

    • C. 

      N

    • D. 

      Y

  • 22. 
    If an organism’s diploid number is 12, its haploid number is
    • A. 

      12.

    • B. 

      6

    • C. 

      24.

    • D. 

      3.

  • 23. 
    Gametes have
    • A. 

      Homologous chromosomes.

    • B. 

      Twice the number of chromosomes found in body cells.

    • C. 

      Two sets of chromosomes.

    • D. 

      One allele for each gene.

  • 24. 
    Gametes are produced by the process of
    • A. 

      Mitosis.

    • B. 

      Meiosis.

    • C. 

      Crossing-over.

    • D. 

      Replication.

  • 25. 
    What is shown in Figure 11-3? (Figure 11-16 in your book)
    • A. 

      Independent assortment

    • B. 

      Anaphase I of meiosis

    • C. 

      Crossing-over

    • D. 

      Replication

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