Trivia Quiz On Codominance And Incomplete Dominance!

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Trivia Quiz On Codominance And Incomplete Dominance! - Quiz

An allele is one of the possible forms of a gene, and they can either completely blend with each other completely and form new phenotype or not blend together completely. This trivia quiz is on codominance and incomplete dominance and is designed to walk you through the two processes and how they occur in the human body.


Questions and Answers
  • 1. 

    Click all of the examples that show INCOMPLETE DOMINANCE.

    • A.

      A blue flower and green flower cross and make a turquoise colored flower

    • B.

      A female dog with a short tail and a male dog with a long tail have puppies with a medium length tails

    • C.

      One parent with straight hair and the other parent with curly hair have kids with wavy hair.

    • D.

      A brown cow and a black blue bull have a calf that is brown and black.

    Correct Answer(s)
    A. A blue flower and green flower cross and make a turquoise colored flower
    B. A female dog with a short tail and a male dog with a long tail have puppies with a medium length tails
    C. One parent with straight hair and the other parent with curly hair have kids with wavy hair.
    Explanation
    The examples that show incomplete dominance are: A blue flower and green flower cross and make a turquoise colored flower, A female dog with a short tail and a male dog with a long tail have puppies with a medium length tails, and One parent with straight hair and the other parent with curly hair have kids with wavy hair. In incomplete dominance, neither allele is completely dominant over the other, resulting in a blending or combination of traits in the offspring.

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  • 2. 

    Click all the ones that show Codomanince.

    • A.

      A chicken with white feathers and a roster with black feathers makes a chicken with white and black feathers.

    • B.

      Parents with blood types of A and B, have a child with AB blood

    • C.

      A child with brown eyes has parents with brown and green eyes.

    • D.

      A flower with red petals and a flower with white petals cross to make a flower with red and white petals.

    Correct Answer(s)
    A. A chicken with white feathers and a roster with black feathers makes a chicken with white and black feathers.
    B. Parents with blood types of A and B, have a child with AB blood
    D. A flower with red petals and a flower with white petals cross to make a flower with red and white petals.
    Explanation
    The given answer is correct because it includes all the examples that demonstrate codominance. In codominance, both alleles in a gene pair are expressed equally and simultaneously, resulting in a phenotype that shows a combination of both traits. In the examples provided, the chicken with white and black feathers, the parents with blood types A and B having a child with AB blood, and the flowers with red and white petals are all instances of codominance, where the traits from both parents are expressed in the offspring.

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  • 3. 

    What distinguishes codominance from incomplete dominance in genetic inheritance?

    • A.

      In codominance, one allele completely masks the effect of another.

    • B.

      In incomplete dominance, the phenotype of heterozygotes is a mix or blend of both alleles.

    • C.

      In codominance, both alleles are expressed fully and separately in the phenotype.

    • D.

      Both B and C are correct.

    Correct Answer
    D. Both B and C are correct.
    Explanation
    In genetic inheritance, incomplete dominance occurs when the phenotype of the heterozygotes is intermediate between those of the homozygotes, effectively blending the contributions of two different alleles (e.g., red and white flowers producing pink flowers). Codominance, on the other hand, involves a scenario where both alleles in a heterozygote are fully expressed without blending, leading to a phenotype that clearly shows both alleles separately (e.g., a cow with both red and white patches where both color genes are expressed). Thus, options B and C correctly describe these patterns, making D the correct combined answer.

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  • 4. 

    A cross of a white chick (WW) with a black chick (BB) produces all speckled offspring (WB) This type of inheritance is known as:

    Correct Answer
    codominance
    Explanation
    Codominance is the type of inheritance where both alleles for a trait are expressed equally in the offspring. In this case, the white allele (W) and black allele (B) are both expressed in the speckled offspring (WB), showing codominance.

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  • 5. 

    If you cross a red plant with a white plant and the offspring is pink, what is that called?

    Correct Answer
    incomplete dominance
    Explanation
    When a red plant is crossed with a white plant and the resulting offspring is pink, it indicates incomplete dominance. Incomplete dominance occurs when neither of the parental traits is completely dominant over the other, resulting in a blending or intermediate phenotype. In this case, the pink color is a combination of the red and white traits, rather than one trait being dominant over the other.

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  • 6. 

    Incomplete Dominance

    • A.

      Both alleles are expressed and the phenotype is a blend

    • B.

      Both alleles are expressed and the genotype is dominant

    • C.

      Neither allele is expressed

    • D.

      Alleles are dominant or recessive

    Correct Answer
    A. Both alleles are expressed and the phenotype is a blend
    Explanation
    This answer suggests that in incomplete dominance, both alleles are expressed and the phenotype is a blend. This means that neither allele is completely dominant over the other, resulting in a phenotype that is a combination or mixture of the traits associated with each allele.

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  • 7. 

    Define codominance

    Correct Answer
    both alleles are expressed and the phenotype shows both traits
    Explanation
    Codominance is a genetic phenomenon where both alleles of a gene are expressed in the phenotype, resulting in the manifestation of both traits. Unlike incomplete dominance, where the traits blend together, in codominance, the traits are expressed independently and simultaneously. This means that neither allele is dominant or recessive over the other, and both traits are fully visible in the organism's phenotype. For example, in a codominant genotype of a flower with red and white alleles, the phenotype would show patches of both red and white coloration.

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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Apr 22, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Jan 06, 2020
    Quiz Created by
    Kyle Pearson
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