AP Biology Chapter 15 Flashcards
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AP Biology Chapter 15 Flashcards

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Questions and Answers

What does the chromosome theory of inheritance state?

  • Genes have specific loci along chromosomes.
  • Chromosomes undergo segregation and independent assortment.
  • Both A and B. (correct)
  • Neither A nor B.
  • What is a wild type?

    The phenotype for a character most commonly observed in populations.

    What is a sex-linked gene?

    A gene located on either sex chromosome.

    What is Duchenne muscular dystrophy?

    <p>A sex-linked disorder characterized by a progressive weakening of the muscles and loss of coordination.</p> Signup and view all the answers

    What is hemophilia?

    <p>A sex-linked recessive disorder defined by the absence of one or more of the proteins required for blood clotting.</p> Signup and view all the answers

    What is a Barr body?

    <p>The inactive X in each cell of a female condenses into a compact object.</p> Signup and view all the answers

    What are linked genes?

    <p>Genes located on the same chromosome that tend to be inherited together.</p> Signup and view all the answers

    What is genetic recombination?

    <p>The production of offspring with combinations of traits that differ from those found in either parent.</p> Signup and view all the answers

    What are parental types?

    <p>Offspring which inherit a phenotype that matches one of the parental phenotypes.</p> Signup and view all the answers

    What are recombinant types?

    <p>Offspring with a phenotype different from each parent.</p> Signup and view all the answers

    What is crossing over?

    <p>The reciprocal exchange of genetic material between nonsister chromatids during prophase I of meiosis.</p> Signup and view all the answers

    What is a genetic map?

    <p>An ordered list of the genetic loci along a particular chromosome.</p> Signup and view all the answers

    What is a linkage map?

    <p>A genetic map based on recombination frequencies.</p> Signup and view all the answers

    What are map units?

    <p>One is equal to a 1% recombination frequency.</p> Signup and view all the answers

    What are cytogenetic maps?

    <p>Locate genes with respect to chromosomal features.</p> Signup and view all the answers

    What is nondisjunction?

    <p>The members of a pair of homologous chromosomes do not move apart properly during meiosis I or sister chromatids fail to separate during meiosis II.</p> Signup and view all the answers

    What is aneuploidy?

    <p>Chromosomal aberration in which one or more chromosomes are present in extra copies or are deficient in number.</p> Signup and view all the answers

    What is monosomic?

    <p>A cell that has only one copy of a particular chromosome instead of two.</p> Signup and view all the answers

    What is trisomic?

    <p>A diploid cell with three copies of a particular chromosome instead of two.</p> Signup and view all the answers

    What is polyploidy?

    <p>The chromosomal alteration in which the organism has more than two complete chromosome sets in all somatic cells.</p> Signup and view all the answers

    What is deletion?

    <p>Occurs when a chromosomal fragment is lost.</p> Signup and view all the answers

    What is duplication?

    <p>Occurs when the deleted fragment becomes attached as an extra segment to a sister chromatid.</p> Signup and view all the answers

    What is inversion?

    <p>Occurs when a chromosomal fragment reattaches to the original chromosome but in the reverse orientation.</p> Signup and view all the answers

    What is translocation?

    <p>Occurs when the fragment joins a non-homologous chromosome, rearranging along the chromosome.</p> Signup and view all the answers

    What is Down syndrome?

    <p>An aneuploid condition resulting from an extra chromosome 21.</p> Signup and view all the answers

    What is genomic imprinting?

    <p>Variation in phenotype depending on whether an allele is inherited from the male or female parent.</p> Signup and view all the answers

    Study Notes

    Chromosome Theory and Genes

    • Chromosome theory of inheritance states that genes reside at specific locations (loci) on chromosomes, which segregate and assort independently during gamete formation.

    Genetic Terminology

    • Wild type refers to the most commonly observed phenotype in a given population for a specific trait.
    • Sex-linked genes are located on sex chromosomes, influencing inheritance patterns associated with gender.

    Genetic Disorders

    • Duchenne muscular dystrophy is a sex-linked disorder marked by muscle weakness and coordination loss.
    • Hemophilia is a sex-linked recessive disorder characterized by the deficiency of blood clotting proteins.

    Cellular Structures

    • Barr bodies are inactive X chromosomes in female cells, condensed and lying along the nuclear envelope.

    Genetic Inheritance

    • Linked genes are those located on the same chromosome and typically inherited together during genetic crosses.
    • Genetic recombination results in offspring with allele combinations that differ from either parent.

    Offspring Types

    • Parental types exhibit phenotypes that match one of their parents.
    • Recombinant types display phenotypes that differ from both parents.

    Meiotic Processes

    • Crossing over involves the exchange of genetic material between nonsister chromatids during prophase I of meiosis, increasing genetic variation.

    Genetic Mapping

    • Genetic maps detail the ordered loci along chromosomes, while linkage maps are based on recombination frequencies.
    • Map units, defined as a 1% recombination frequency, serve as a measure in genetic mapping.
    • Cytogenetic maps locate genes in relation to chromosomal structures.

    Aberrations and Variations

    • Nondisjunction occurs when homologous chromosomes or sister chromatids fail to separate during meiosis, leading to gametes with abnormal chromosome numbers.
    • Aneuploidy involves presence of extra or missing chromosomes, resulting in conditions like monosomy (one copy) or trisomy (three copies).
    • Polyploidy refers to organisms with more than two complete sets of chromosomes.

    Chromosomal Alterations

    • Deletion entails the loss of a chromosomal fragment.
    • Duplication arises when a deleted segment is added to a sister chromatid.
    • Inversion is the reattachment of a chromosomal fragment in the reverse orientation.
    • Translocation involves a chromosomal fragment joining a non-homologous chromosome, altering genetic layout.

    Down Syndrome and Imprinting

    • Down syndrome is an aneuploid condition caused by an extra chromosome 21, resulting in 47 chromosomes total in each cell.
    • Genomic imprinting leads to phenotypic differences based on the parental origin of an allele.

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    Test your knowledge of key concepts from AP Biology Chapter 15 with these flashcards. Topics include the chromosome theory of inheritance, wild type phenotypes, and sex-linked genes. Perfect for quick reviews and reinforcing your understanding of genetics.

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