The Genetics Of Sex

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The Genetics Of Sex

Genetics is a branch of the scientific study of biology which deals with heredity, genes and genetic variation, and allows us to gain specific knowledge about our bodies that we couldn’t be able to tell with the naked eye. In the following quiz, we’ll be taking a look at genetics from the perspective of sex! What do you know about X chromosomes, Y chromosomes and more? Let’s find out!


Questions and Answers
  • 1. 
    In honeybees, fertilized eggs develop into:
    • A. 

      Fruit flies.

    • B. 

      Males.

    • C. 

      Females.

    • D. 

      Intersex bees.

    • E. 

      None of the above.

  • 2. 
    In humans, the homogametic sex is the _______.
  • 3. 
    If a mutant allele behaves as a dominant allele in males but as a recessive allele in females, then this is an example of a(n) _______ trait. (We didn't cover this one this year, 2010).
  • 4. 
    In fowl, the cock-feather gene is only expressed in roosters that are homozygous for that allele, so this is an example of a(n) _______ trait. (We didn't cover this one this year, 2010).
  • 5. 
    The all-important gene on the human Y chromosome that causes the gonad to develop into a testis is the gene called _______.
  • 6. 
    The protein made by the male-determining gene on the Y chromosome in humans is called ________.
  • 7. 
    X chromosome inactivation in mammals is the mechanism by which _________ occurs.
  • 8. 
    The number of Barr bodies that an XXX human female should have _____.
  • 9. 
    The sex of calico or tortoise shell cat (usually) ________.