Genetics: Pleiotropic Effects and Sickle Cell Anemia
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Questions and Answers

What is a characteristic of a gene with pleiotropic effects?

  • It only affects one aspect of an organism's physiology
  • It is only found in haploid organisms
  • It can affect various aspects of an organism's development or physiology (correct)
  • It has a single phenotypic effect
  • What is the consequence of having multiple alleles for a particular trait in a population?

  • Reduced genetic variation
  • Increased genetic variation (correct)
  • Only two alleles are possible
  • No change in genetic variation
  • What is the typical number of chromosomes found in human cells?

  • 23
  • 46 (correct)
  • 48
  • 47
  • What determines an individual's blood group?

    <p>The genes inherited from their parents (B)</p> Signup and view all the answers

    What is a characteristic of X-Linked traits?

    <p>They are more common due to the larger X chromosome (A)</p> Signup and view all the answers

    What determines an individual's sex in eukaryotic organisms?

    <p>Sex chromosomes (D)</p> Signup and view all the answers

    What is the name of the genetic disorder caused by a mutation in the gene that encodes the red blood cell protein called hemoglobin?

    <p>Sickle Cell Anemia (C)</p> Signup and view all the answers

    What is the function of the centromere during cell division?

    <p>To ensure proper alignment and segregation of chromosomes (C)</p> Signup and view all the answers

    What is the complex of DNA and proteins that make up the chromosome's structure?

    <p>Chromatin (B)</p> Signup and view all the answers

    What is the term for the presence of more than two alleles for a particular trait in a population?

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

    What is the purpose of telomeres?

    <p>To protect the ends of chromosomes (A)</p> Signup and view all the answers

    What is the result of DNA replication in a chromosome?

    <p>Formation of chromatid (D)</p> Signup and view all the answers

    What is the cause of Down syndrome?

    <p>Nondisjunction during maternal meiosis (A)</p> Signup and view all the answers

    What is the result of nondisjunction during meiosis?

    <p>Gain of a chromosome (D)</p> Signup and view all the answers

    What is the term for an organism having an additional copy of a particular chromosome?

    <p>Trisomy (C)</p> Signup and view all the answers

    What is the result of Trisomy 21?

    <p>Down Syndrome (B)</p> Signup and view all the answers

    What is the karyotype of an individual with Trisomy 21?

    <p>47, XY +21 (A)</p> Signup and view all the answers

    What is the cause of Edwards Syndrome?

    <p>Nondisjunction during maternal meiosis (B)</p> Signup and view all the answers

    What is the potential consequence of duplications in certain genes?

    <p>Developmental abnormalities and intellectual disabilities (D)</p> Signup and view all the answers

    What is the mechanism by which inversions occur?

    <p>During DNA repair processes (D)</p> Signup and view all the answers

    What is the result of the pericentric inversion of chromosome 9?

    <p>Increased risk of miscarriages and infertility (C)</p> Signup and view all the answers

    What is the consequence of inversions on homologous chromosomes during meiosis?

    <p>Disrupted chromosome pairing (A)</p> Signup and view all the answers

    What is the result of the translocation involving chromosomes 9 and 22?

    <p>BCRABL1 fusion gene (C)</p> Signup and view all the answers

    What type of leukemia is associated with the Philadelphia Chromosome?

    <p>Both CML and ALL (D)</p> Signup and view all the answers

    What is one of the implications of translocations?

    <p>They can lead to the development of genetic disorders and cancers (B)</p> Signup and view all the answers

    What is the primary purpose of karyotyping?

    <p>To examine an individual's chromosomes for abnormalities or variations (D)</p> Signup and view all the answers

    At what stage of cell division are chromosomes typically harvested for karyotyping?

    <p>Metaphase (D)</p> Signup and view all the answers

    What is the purpose of staining chromosomes in karyotyping?

    <p>To produce characteristic banding patterns for identification (C)</p> Signup and view all the answers

    What is the final step in the karyotyping process?

    <p>Photography and analysis (B)</p> Signup and view all the answers

    What type of sample is typically used for karyotyping?

    <p>Blood sample (B)</p> Signup and view all the answers

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