Drosophila Genetics: Genotype Determination Quiz
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Questions and Answers

In co-dominance, what happens to the contributions of both alleles?

  • They blend together to form a new phenotype
  • They cancel each other out
  • They are both visible in the phenotype (correct)
  • One completely dominates the other
  • What is the result of the incomplete expression of the dominant trait (R) in plants with genotype Rr?

  • Pink flowers (correct)
  • Flowers with more red pigment
  • Completely white flowers
  • Purple flowers
  • What is an example of intermediate dominance mentioned in the text?

  • AB blood type inheritance in humans
  • Antirrhinum flower color inheritance (correct)
  • Plumage color inheritance in Andalusian fowls
  • Eggplant fruit color inheritance
  • How do lethal genes affect the Mendelian segregation of traits?

    <p>Result in nonviable offspring and affect typical ratios</p> Signup and view all the answers

    What ratios are described for both phenotypic and genotypic outcomes in generation F2 with regards to lethal genes?

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

    Which phenomenon describes when two or more dominant alleles for a gene are functional and expressed in combination?

    <p>Co-dominance</p> Signup and view all the answers

    In which scenario are both phenotypic outcomes expressed equally due to the interaction of two alleles?

    <p><strong>Bb</strong> Andalusian fowl plumage color inheritance</p> Signup and view all the answers

    'The classical Mendelian segregation of 3/4 dominants to 1/4 recessive occurs when gametes unite at random.' What observation led to this conclusion?

    <p>Yellow fur in mice progeny</p> Signup and view all the answers

    What term describes the situation when the genotypic and phenotypic ratios are both 1:2:1 in a certain generation?

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

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