Biology Exam 4 Pt. 2

5 Questions  I  By Hisjuliet
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  • 1. 
    A woman of blood group A has a child with a man of blood group B.  The child's blood is type O.  What must be the genotype of the parents?
    • A. 

      Mother: I(A)I(A); father I(B)I(A)

    • B. 

      Mother: I(A)i(O); father: I(B)I(B)

    • C. 

      Mother: I(A)i(O); father I(B)i(O)

    • D. 

      Mother: I(A)i(O); father I(B)I(B)

    • E. 

      It is impossible for these individuals to have a chlld with type O blood.


  • 2. 
    Cocominance
    • A. 

      Is when heterozygotes show a phenotype intermediate between those of the two homozygotes.

    • B. 

      Involves the expression of both alleles at a locus producing two different phenotypes.

    • C. 

      Is only found in mammalian enzyme production.

    • D. 

      Involves one allele having more than one phenotypic effect.

    • E. 

      Would result in pink flowers from a cross between white and red flowers.


  • 3. 
    In Mendel's experiments, if the allele for tall (7) plants was incompletely dominant over the allele for short (t) plants, what offspring would have resulted from crossing two Tt plants?
    • A. 

      1/4 tall; 1/2 intermediate height; 1/4 short

    • B. 

      1/2 tall; 1/4 intermediate height; 1/4 short

    • C. 

      1/4 tall; 1/4 intermediate height; 1/2 short

    • D. 

      All tall offspring

    • E. 

      All intermediate height offspring


  • 4. 
    Classical albinism results from a recessive allele.  Which of the following is the expected ratio for the progeny when a normally pigmented male with an albino father has children with an albino woman?
    • A. 

      3/4 normal; 1/4 albino

    • B. 

      3/4 albino; 1/4 normal

    • C. 

      1/2 normal; 1/2 albino

    • D. 

      All normal

    • E. 

      All albino


  • 5. 
    A human male carrying an allele for a trait on the X chromosome is
    • A. 

      Heterozygous.

    • B. 

      Homozygous.

    • C. 

      Hemizygous.

    • D. 

      Monozygous.

    • E. 

      Holozygous.


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