Incomplete Dominance and Sex-Linked Traits
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Questions and Answers

What is a sex-linked trait?

  • A trait determined by an allele or gene on chromosome 23
  • A trait determined by an allele or gene on the sex chromosomes (either X or Y) (correct)
  • A trait determined by an allele or gene on chromosome 1
  • A trait determined by both X and Y chromosomes

    • How are X-linked traits influenced?

  • By genes located on the Y chromosome
  • By genes located on the X chromosomes (correct)
  • By genes located on both X and Y chromosomes
  • By genes located on autosomes

    • Why are recessive X-linked traits more common in males than females?

  • Because males have two X chromosomes
  • Because males have one X chromosome (correct)
  • Because females have two X chromosomes
  • Because females have one X chromosome

    • What genetic disorder impairs a person's control over blood clotting?

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

    Which chromosome is much shorter than the X chromosome?

    <p>Y chromosome</p> Signup and view all the answers

    From the text, which condition is caused by a mutation to the red and/or green retinal photoreceptors located on the X chromosome?

    <p>Color-Blindness</p> Signup and view all the answers

    Which molecule acts as a genetic code and carries genetic information in living organisms?

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

    In human cells, which chemical units make up the genetic code carried by DNA?

    <p>Adenine, Cytosine, Thymine, Guanine</p> Signup and view all the answers

    How many chromosomes do humans typically have?

    <p>46</p> Signup and view all the answers

    Which statement best describes the role of genes in passing traits from parents to children?

    <p>Genes contain the instructions for building and maintaining the body.</p> Signup and view all the answers

    What is the pairing of adenine with thymine and guanine with cytosine a part of?

    <p>Genetic code formation</p> Signup and view all the answers

    What is the difference between genotype and phenotype?

    <p>Genotype refers to the two alleles an organism has inherited for a particular gene, while phenotype refers to the observable trait of an organism.</p> Signup and view all the answers

    In genetic inheritance, what does a dominant allele do in relation to a recessive allele?

    <p>A dominant allele overrules a recessive allele.</p> Signup and view all the answers

    What happens in codominance?

    <p>Both alleles of a gene are distinctly expressed.</p> Signup and view all the answers

    Which genetic inheritance type involves both alleles being partially expressed in an intermediate phenotype?

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

    If a plant has one recessive allele and one dominant allele for a certain gene, what will be the result according to genetic inheritance principles?

    <p>The plant will exhibit only the recessive trait.</p> Signup and view all the answers

    In genetic inheritance, what is the function of a recessive allele?

    <p>A recessive allele is expressed only when two copies are present.</p> Signup and view all the answers

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