Bio Test 2 (part 5)

11 Questions

Settings
Please wait...
Biology Quizzes & Trivia

A biology exam, part 5 of 5. 55 question test. Exam involving topics such as photosynthesis and cellular respiration.


Questions and Answers
  • 1. 
    Some dogs have erect ears; others have drooping ears. Some dogs bark when following a scent; others are silent. Erect ears and barking are due to dominant alleles located on different chromosomes. A dog homozygous for both dominant traits is mated to a droopy-eared, silent follower. The expected phenotypic ration in the F1 generation is
    • A. 

      9:3:3:1

    • B. 

      100 percent of one phenotype

    • C. 

      1:1

    • D. 

      1:2:1

    • E. 

      None of these

  • 2. 
    In cocker spaniels, black coat color (B) is dominant over red (b), and solid color (S) is dominant over spotted (s). If a solid red male is crossed with a solid black female to produce a red, spotted puppy, the genotypes of the parents (with male genotype first) will be
    • A. 

      Bb Ss : Bb Ss

    • B. 

      Bb Ss : Bb Ss

    • C. 

      Bb ss : Bb Ss

    • D. 

      Bb Ss : Bb ss

    • E. 

      Bb ss : Bb ss

  • 3. 
    Susan, a mother with type B blood, has a child with type O blood. She claims that Craig, who has type A blood, is the father. He claims that he cannot possibly be the father. Further blood tests ordered by the judge reveal that Craig is AA. The judge rules that
    • A. 

      Susan is right and Craig must pay child support.

    • B. 

      Craig is right and doesn't have to pay child support.

    • C. 

      Susan cannot be the real mother of the child; there must have been an error made at the hospital.

    • D. 

      It is impossible to reach a decision based on the limited data availabe.

    • E. 

      None of these.

  • 4. 
    Genes at one locus that affect the expression of genes at a different locus are said to be
    • A. 

      Epistatic.

    • B. 

      Linked.

    • C. 

      Codominant.

    • D. 

      Penetrant.

    • E. 

      Alleles.

  • 5. 
    Genes that are located on the same chromosome
    • A. 

      Tend to be inherited together.

    • B. 

      Will appear together in the gamete.

    • C. 

      Are said to be linked.

    • D. 

      May be seperated during crossing over.

    • E. 

      All of these.

  • 6. 
    The rold of environmental factors on gene expression is illustrated by the
    • A. 

      Varying plant height of genetically identical yarrow plants when grown at different elevations.

    • B. 

      Flower color of hydrangeas grown in soils of differing pH.

    • C. 

      Depression response that some persons make to very stressful situations.

    • D. 

      Fur pattern of Himalayan rabbits.

    • E. 

      All of these.

  • 7. 
    The reason for the darker fur on the tail, ears, nose, and legs of a Siamese cat is
    • A. 

      Incomplete dominance.

    • B. 

      The activity of a heat-sensitive enzyme involved in melanin production.

    • C. 

      Quantitative inheritence.

    • D. 

      Epistasis.

    • E. 

      The presence of different alleles for fur color in these regions.

  • 8. 
    A graph of phenotypic variation similar to the illustration below strongly suggests
    • A. 

      Incomplete dominance.

    • B. 

      Codominance.

    • C. 

      Epistasis.

    • D. 

      Polygenic inheritance.

    • E. 

      Environmental effects on phenotype.

  • 9. 
    An autosomal recessive disorder
    • A. 

      Requires that only one parent be a carrier.

    • B. 

      Displays its symptoms only in heterozygotes.

    • C. 

      Is more frequent in males than females.

    • D. 

      Will appear only in children of parents who both carry the gene.

    • E. 

      Is dominant in females.

  • 10. 
    A color-blind man and a woman with normal vision whose father was color blind have a son. Color blindness, in this case, is caused by an X-linked recessive gene. If only the male offspring are considered, the probability that their son is color blind is
    • A. 

      .25 (or 25 percent)

    • B. 

      .50 (or 50 percent)

    • C. 

      .75 ( or 75 percent)

    • D. 

      1.00 (or 100 percent)

    • E. 

      None of these.

  • 11. 
    If a daughter expresses an X-linked recessive gene, she inherited the trait from
    • A. 

      Her mother.

    • B. 

      Her father.

    • C. 

      Both parents.

    • D. 

      Neither parent.

    • E. 

      Her grandmother.