Mendelian and Non-Mendelian Inheritance

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Questions and Answers

What is the primary function of the enzyme encoded by the I gene in determining ABO blood type?

  • Forming the Lewis antigen
  • Encoding the Rh blood type antigen
  • Adding fucose to a protein in the cell membrane
  • Attaching a different molecule to the sugar chain protruding from RBC cell membrane (correct)

Which of the following is an example of a phenocopy?

  • A child developing AIDS due to environmental factors (correct)
  • A twin developing leukemia due to genetic inheritance
  • A person's Rh blood type being determined by the C, D, and E genes
  • A person inheriting the A allele from their parents

What is the role of the H gene in determining ABO blood type?

  • Encoding an enzyme that attaches fucose to a protein in the cell membrane (correct)
  • Encoding an enzyme that adds 4 monosaccharides to the sugar fucose
  • Encoding an enzyme that attaches a galactose or N-acetyl galactosamine molecule to the sugar chain
  • Determining the Rh blood type antigen

How many alleles are associated with the I gene?

<p>3 (C)</p>
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What is the function of the L gene (Lewis) in determining ABO blood type?

<p>Encoding an enzyme that adds 4 monosaccharides to the sugar fucose (C)</p>
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Which of the following genes determines the Rh blood type antigen?

<p>C, D, and E genes (D)</p>
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What is the consequence of the I gene having 3 alleles (A, B, and i) in determining ABO blood type?

<p>The formation of a combination of antigens (D)</p>
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What is the role of the environment in the development of a phenocopy?

<p>Causing the trait to develop through environmental factors (A)</p>
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Which of the following is NOT a function of the genes involved in determining ABO blood type?

<p>Forming the DNA molecule (D)</p>
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What is the characteristic of the alleles associated with the I gene?

<p>They are codominant (C)</p>
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