Mendel’s Pea Shape and Color Molecular Explanation
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Questions and Answers

What does the R allele encode?

  • Chlorophyll
  • Starch branching enzyme (Sbe1) (correct)
  • Sucrose
  • Stay green enzyme (Sgr)

    • What is the consequence of the r allele not making Sbe1?

  • Sucrose and unbranched starch build up, leading to wrinkled peas (correct)
  • Increased production of chlorophyll, leading to greener peas
  • Chlorophyll is not broken down and the peas remain green
  • Reduced production of starch, leading to smoother peas

    • Which gene determines the Stay green enzyme (Sgr)?

  • r allele
  • R allele
  • Y allele (correct)
  • Unspecified allele

    • What is the general principle about the relationship between a specific gene and its encoded protein?

    <p>A specific gene determines a specific protein, whose activity may affect the phenotype</p> Signup and view all the answers

    What is the expected outcome of a dominant allele?

    <p>It usually determines a normally functioning protein</p> Signup and view all the answers

    What effect does the y allele have on chlorophyll breakdown?

    <p>It has no effect on chlorophyll breakdown</p> Signup and view all the answers

    What does the y allele fail to make?

    <p>Stay green enzyme (Sgr)</p> Signup and view all the answers

    2.21

    <p>option1</p> Signup and view all the answers

    question1

    <p>option1</p> Signup and view all the answers

    question1

    <p>option1</p> Signup and view all the answers

    question1

    <p>option1</p> Signup and view all the answers

    question1

    <p>option1</p> Signup and view all the answers

    What type of dominance is exhibited when the F1 hybrids display traits of both parents?

    <p>Codominance</p> Signup and view all the answers

    Which phenomenon results in all progeny being spotted and dotted?

    <p>Codominance</p> Signup and view all the answers

    What controls the type of sugar polymer on the surface of red blood cells?

    <p>Gene I</p> Signup and view all the answers

    What type of alleles result in individuals having both A and B sugars on their red blood cells?

    <p>Two alleles with different sugars</p> Signup and view all the answers

    What determines the type of dominance (complete, incomplete dominance, codominance)?

    <p>The type of proteins encoded</p> Signup and view all the answers

    Which type of dominance relation does not affect the transmission of alleles?

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

    What is more complex according to McGraw Hill 24?

    <p>Interpretation of phenotype/genotype relations</p> Signup and view all the answers

    Which of the following is an example of a disease caused by a recessive allele?

    <p>Marfan syndrome</p> Signup and view all the answers

    What is the frequency of cystic fibrosis in humans?

    <p>1/2,500</p> Signup and view all the answers

    In pedigrees with dominant traits, what pattern of inheritance is typically observed?

    <p>Vertical</p> Signup and view all the answers

    Which disease exhibits a dominant pattern of inheritance?

    <p>Neurofibromatosis type I</p> Signup and view all the answers

    What is the recurrence risk for each sibling of the proband in autosomal recessive inheritance?

    <p>25%</p> Signup and view all the answers

    Which of the following indicates that dominance is not always complete?

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

    What phenotype ratios reflect the genotype ratios in incomplete dominance?

    <p>1:2:1</p> Signup and view all the answers

    Which disease is caused by a completely dominant allele?

    <p>Marfan syndrome</p> Signup and view all the answers

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