Chapter 15

Last update by mayur on 03/27/2014
548800 People have viewed this Quiz
  • Share

What is the source of the extra chromosome 21 in an individual with Down syndrome?

A) Nondisjunction in the mother only

B) Nondisjunction in the father only

C) Duplication of the chromosome

D) Nondisjunction or translocation in either parent

E) It is impossible to detect with current technology



Answer:

D) Nondisjunction or translocation in either parent



View Chapter 15 as Flashcard Deck

Related Quiz Content
  • feldman2009
    Answered in Chapter 15

    A couple has a child with Down syndrome when the mother is 39 years old at the time ofdelivery. Which is the most probable cause?

    A) The woman inherited this tendency from her parents.

    B) One member of the couple carried a translocation.

    C) One member of the couple underwent nondisjunction in somatic cell production.

    D) One member of the couple underwent nondisjunction in gamete production.

    D) One member of the couple underwent nondisjunction in gamete production.
  • feldman2009
    Answered in Chapter 15

    In 1956 Tijo and Levan first successfully counted human chromosomes. The reason it wouldhave taken so manyyears to have done so would have included all but which of the following?

    A) Watson and Crick's structure of DNA was not done until 1953.

    B) Chromosomes were piled up on top of one another in the nucleus.

    C) Chromosomes were not distinguishable duringinterphase.

    D) A method had not yet been devised to halt mitosis at metaphase.

    A) Watson and Crick's structure of DNA was not done until 1953.



  • feldman2009
    Answered in Chapter 15

    At which phase(s) is it preferable to obtain chromosomes to prepare a karyotype?

    A) Early prophase

    B) Late telophase

    C) Anaphase

    D) Late anaphase or early telophase

    E) Late prophase or metaphase

    E) Late prophase or metaphase
  • feldman2009
    Answered in Chapter 15

    Which of the following statements describes genomic imprinting?

    A) It explains cases in which the gender of the parent from whom an allele is inherited affects theexpression of that allele.

    B) It is greatest in females because of the larger maternal contribution of cytoplasm.

    C) It may explain the transmission of Duchenne muscular dystrophy.

    D) It involves an irreversible alteration in the DNA sequence of imprinted genes.

    A) It explains cases in which the gender of the parent from whom an allele is inherited affects theexpression of that allele.



  • feldman2009
    Answered in Chapter 15

    The pedigree in Figure 15.4 shows thetransmission of a trait in a particular family. Based onthis pattern of transmission, the trait is most likely

    A) mitochondrial.

    B) autosomal recessive.

    C) sex-linked dominant.

    D) sex-linked recessive.

    E) autosomal dominant.



    A) mitochondrial.



  • feldman2009
    Answered in Chapter 15

    A gene is considered to be non-Mendelian in its inheritance pattern if it seems to "violate"Mendel's laws. Which of the following would then NOT be considered non-Mendelian?

    A) A gene whose expression variesdepending on the gender of the transmitting parent

    B) A gene derived solely from maternal inheritance

    C) A gene transmitted via the cytoplasm or cytoplasmic structures

    D) A gene transmitted to males from the maternal line and from fathers to daughters

    E) A gene transmitted by a virus to egg-producing cells



    D) A gene transmitted to males from the maternal line and from fathers to daughters



  • feldman2009
    Answered in Chapter 15

    Genomic imprinting is generally due to the addition of methyl (

    D) Methylation must be reversible in ovarian and testicular cells.



  • feldman2009
    Answered in Chapter 15

    Correns described thatthe inheritance of variegated color on the leaves of certain plants wasdetermined by the maternal parent only. What phenomenon does this describe?

    A) Mitochondrial inheritance

    B) Chloroplast inheritance

    C) Genomic imprinting

    D) Infectious inheritance

    E) Sex-linkage

    B) Chloroplast inheritance



  • feldman2009
    Answered in Chapter 15

    Mitochondrial DNA is primarily involved in coding for proteins needed for electron

    transport. Therefore in which body systems would you expect most mitochondrial genemutations to be exhibited?

    A) The immune system and the blood

    B) Excretory and respiratory systems

    C) The skin and senses

    D) Nervous and muscular systems

    E) Circulation



    D) Nervous and muscular systems