Skip to main content
Pearson+ LogoPearson+ Logo

X-Inactivation quiz #2 Flashcards

X-Inactivation quiz #2
Control buttons has been changed to "navigation" mode.
1/10
  • What is a Barr body?
    A Barr body is the highly condensed, inactive X chromosome found in female cells.
  • What are the three phases of X-chromosome inactivation?
    The three phases of X-chromosome inactivation are initiation, spreading, and maintenance.
  • Which is an inactivated X chromosome in a female body?
    An inactivated X chromosome in a female body is referred to as a Barr body.
  • How many Barr bodies would you expect to find in a cell from a person with the following genotype: XXY?
    In a person with the XXY genotype, you would expect to find one Barr body.
  • Tortoise shell cats have variegated coat colors caused by X inactivation and are always what?
    Tortoise shell cats are always female because X inactivation leads to the expression of different fur color alleles.
  • What happens to the inactivated X chromosome in female mammals when cells divide?
    The inactivated X chromosome remains inactive and is passed on as a Barr body to daughter cells during cell division.
  • What describes X inactivation in humans?
    X inactivation in humans is a random process where one of the two X chromosomes in females is inactivated to balance gene expression with males.
  • How does X-chromosome inactivation take place?
    X-chromosome inactivation takes place through a random process during early development, leading to one X chromosome becoming a Barr body.
  • Why do calico cats have patches of different colors?
    Calico cats have patches of different colors due to random X inactivation, which leads to different alleles being expressed in different cells.
  • Why is X inactivation important for genetic expression in females?
    X inactivation is important because it ensures that females, with two X chromosomes, do not have double the expression of X-linked genes compared to males.