Genetics: Dominant vs. Recessive Genes
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Questions and Answers

If an individual has the genotype AA for the ABO blood group, what blood type do they have?

  • Blood type AB
  • Blood type A (correct)
  • Blood type B
  • Blood type O
  • If a child inherits an A gene and an O gene, but both parents do not have blood type O, which blood type does the child likely have?

  • Blood type A (correct)
  • Blood type B
  • Blood type O
  • Blood type AB
  • If a child inherits a B gene and an O gene from their parents, what is the probability that they will have blood type O?

  • 25%
  • 100%
  • 0% (correct)
  • 50%
  • If two parents with blood type AB have a child, what is the possible blood type of the child?

    <p>A, B, AB (B)</p> Signup and view all the answers

    If a child has blood type AB, what must be the genotype of their parents?

    <p>One parent must have blood type AB and the other must have either blood type A or B (B)</p> Signup and view all the answers

    Flashcards

    Dominant Gene

    A gene that expresses its trait even if only one copy is present.

    Recessive Gene

    A gene that only expresses its trait when two copies are present.

    ABO Blood Group System

    A classification system for human blood types based on the presence of A, B, or O genes.

    Blood Group A Inheritance

    Occurs when a child inherits gene A from one parent and O from the other.

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    Blood Group O Inheritance

    Occurs only if a child inherits gene O from both parents.

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    Study Notes

    Dominant vs. Recessive Genes

    • Dominant genes always express themselves if present.
    • Recessive genes will only express if no dominant gene is present (meaning both genes are recessive).

    ABO Blood Group System

    • Genes A and B are dominant to gene O.
    • If a child receives gene A from one parent and gene O from the other, the child's blood type will be A.
    • If a child receives gene B from one parent and gene O from the other, the child's blood type will be B.
    • A child will only have blood type O if they receive the gene O from both parents.

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    Description

    This quiz explores the concepts of dominant and recessive genes, particularly focusing on how they influence traits such as blood types in the ABO blood group system. Understand how gene expression depends on the presence or absence of dominant alleles. Test your knowledge on genetic inheritance mechanisms!

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