Chapter 02 Genetics: From Genes to Genomes Quiz
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Questions and Answers

What is the phenomenon of a single gene determining several distinct and seemingly unrelated characteristics called?

  • Multiple alleles
  • Complete dominance
  • Pleiotropy (correct)
  • Codominance
  • In pleiotropic genes, what can be the phenotype of heterozygotes?

  • Lethal
  • Visible (correct)
  • Invisible
  • Regulatory
  • What is the term for the phenomenon where phenotypes coincide with genotypes in a ratio of 1:2:1?

  • Codominance
  • Recessive lethal alleles
  • Incomplete dominance
  • Complete dominance (correct)
  • What is the term for the phenomenon where all alleles are equally viable, resulting in a series of 3:1 or 1:2:1 ratios?

    <p>Multiple alleles</p> Signup and view all the answers

    What are the alleles called when heterozygotes survive but may have a visible phenotype?

    <p>Recessive lethal alleles</p> Signup and view all the answers

    Which type of extension results in phenotypes unlike either homozygote?

    <p>Incomplete dominance</p> Signup and view all the answers

    Which term describes the phenomenon where more than two alleles exist for a particular gene in a population?

    <p>Multiple alleles</p> Signup and view all the answers

    What is the significance of dominance relations in genetics?

    <p>They control the expression of genes in an individual</p> Signup and view all the answers

    Which blood type is considered as the universal recipient for blood transfusions?

    <p>Type AB</p> Signup and view all the answers

    What is the primary function of histocompatibility antigens encoded by HLA genes?

    <p>Facilitate proper immune response to foreign antigens</p> Signup and view all the answers

    What is the source of new alleles in a population according to the text?

    <p>Mutation of genetic material</p> Signup and view all the answers

    What does allele frequency represent in a population?

    <p>The percentage of the total number of gene copies for one allele</p> Signup and view all the answers

    Which term refers to a gene with more than one common allele in a population?

    <p>Polymorphic gene</p> Signup and view all the answers

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