Genetics Hardest Trivia Questions! Quiz

40 Questions

Settings
Please wait...
Genetics Hardest Trivia Questions! Quiz

Have you just finished chapter four in your genetics course and think that you were a hundred percent attentive? The quiz below is considered the hardest a student may come across, and for those that can tackle it, no exam can be difficult for them. Do you think that you have what it takes? Give it a shot and share your score.


Questions and Answers
  • 1. 
    In humans SRY is the male determining gene.  
    • A. 

      True

    • B. 

      False

  • 2. 
    Female mammals that are heterozygous for an X-linked gene have patches of cells that express one allele and patches of cells that express the other.  
    • A. 

      True

    • B. 

      False

  • 3. 
    The cellular reason for X-inactivation is to reduce the amount of nondisjunction during meiosis.  
    • A. 

      True

    • B. 

      False

  • 4. 
    The condition XXXY is always lethal in humans.  
    • A. 

      True

    • B. 

      False

  • 5. 
    The condition of having no X chromosomes, for example YO, is lethal in humans.  
    • A. 

      True

    • B. 

      False

  • 6. 
    Temperature during embryonic development determines sex in reptiles like turtles and alligators.  
    • A. 

      True

    • B. 

      False

  • 7. 
    In species in which females are the homogametic sex, gender of offspring is determined by the male.  
    • A. 

      True

    • B. 

      False

  • 8. 
    A female with androgen insensitivity may have XY sex chromosomes rather than XX.  
    • A. 

      True

    • B. 

      False

  • 9. 
    Species in which individuals have only male or only female reproductive structures are called dioecious.  
    • A. 

      True

    • B. 

      False

  • 10. 
    The X and Y chromosomes are named after their characteristic shape.  
    • A. 

      True

    • B. 

      False

  • 11. 
    • A. 

      A color blind female

    • B. 

      A color blind male

    • C. 

      A non-color blind female

    • D. 

      A non-color blind male

  • 12. 
    If a female Drosophila that is heterozygous for a recessive X-linked mutation is crossed to a wild-type male, what proportion of female progeny will have the mutant phenotype?  
    • A. 

      100%

    • B. 

      0%

    • C. 

      33%

    • D. 

      25%

  • 13. 
    In a germ-line cell from a female grasshopper (XX-XO sex determination system), when do the homologous X chromosomes segregate?  
    • A. 

      During mitosis

    • B. 

      During meiosis I, anaphase

    • C. 

      During meiosis II, anaphase

    • D. 

      They do not segregate; gametes contain a copy of X and a copy of Y

  • 14. 
    In a germ-line cell from a human male that is dividing, when do the X and Y chromosomes segregate?  
    • A. 

      During mitosis

    • B. 

      During meiosis I, anaphase

    • C. 

      During meiosis II, anaphase

    • D. 

      They do not segregate; gametes contain a copy of X and a copy of Y

  • 15. 
    A eukaryotic diploid cell from an organism with the ZZ-ZW sex determination system has two pairs of autosomes and a pair of sex chromosomes, Z and W, shown below.  The individual from which this cell came is    
    • A. 

      Male

    • B. 

      Female

    • C. 

      Hermaphrodite

    • D. 

      Monoecious

  • 16. 
    • A. 

      One chromosome with A allele, one with B allele, one Z, one W

    • B. 

      One chromosome with A allele, one with a allele, one with B allele, one with b allele, one Z, one W

    • C. 

      A pair of sister chromatids with A allele, a pair of sister chromatids with B allele, a pair of sister chromatids Z, a pair of sister chromatids W

    • D. 

      A pair of sister chromatids with a allele, a pair of sister chromatids with B allele, a pair of sister chromatids W

    • E. 

      C and D are both possible

  • 17. 
    • A. 

      1/2

    • B. 

      1/4

    • C. 

      1/6

    • D. 

      1/8

  • 18. 
    • A. 

      1/8

    • B. 

      1/16

    • C. 

      9/16

    • D. 

      9/32

  • 19. 
    A eukaryotic diploid cell from an organism with the XX-XO sex determination system has two pairs of autosomes and one X chromosome, shown below. The individual from which this cell came is a:
    • A. 

      Male

    • B. 

      Female

    • C. 

      Hermaphrodite

    • D. 

      Monoecious

  • 20. 
    • A. 

      One chromosome with A allele, one with B allele, and two X chromosomes

    • B. 

      One chromosome with A allele, one with a allele, one with B allele, one with b allele, and two X chromosomes

    • C. 

      A pair of sister chromatids with A allele, a pair of sister chromatids with B allele

    • D. 

      A pair of sister chromatids with a allele, a pair of sister chromatids with B allele, a pair of sister chromatids X

    • E. 

      C and D are both possible

  • 21. 
    • A. 

      1/2

    • B. 

      1/4

    • C. 

      1/6

    • D. 

      1/8

  • 22. 
    Which of the following human genotypes is associated with Klinefelter syndrome?  
    • A. 

      XXY

    • B. 

      XXYY

    • C. 

      XXXY

    • D. 

      All of the above

    • E. 

      None of the above

  • 23. 
    A Barr body is a(n)  
    • A. 

      Gene on the X chromosome that is responsible for female development.

    • B. 

      Patch of cells that has a phenotype different from surrounding cells because of variable X inactivation.

    • C. 

      Inactivated X chromosome, visible in the nucleus of a cell that is from a female mammal.

    • D. 

      Extra X chromosome in a cell that is the result of nondisjunction.

    • E. 

      Extra Y chromosome in a cell that is the result of nondisjunction

  • 24. 
    If a male bird that is heterozygous for a recessive Z-linked mutation is crossed to a wild type female, what proportion of the progeny will be mutant males?  
    • A. 

      0%

    • B. 

      100%

    • C. 

      75%

    • D. 

      50%

    • E. 

      25%

  • 25. 
    List three dosage compensation strategies for equalizing the amount of sex chromosome gene products.  
    • A. 

      Inactivation of one sex chromosome in the homogametic sex

    • B. 

      Halving the activity of genes on both sex chromosomes in the homogametic sex

    • C. 

      Increasing the activity of genes on the sex chromosome in the heterogametic sex

    • D. 

      Not listed

  • 26. 
    List six different sex determination systems and a representative organism for each.  
    • A. XX-XO
    • A.
    • B. XX-XY
    • B.
    • C. ZZ-ZW
    • C.
    • D. Haplodiploidy
    • D.
    • E. Genic balance
    • E.
    • F. Environmental
    • F.
  • 27. 
    List different mechanisms for generating sexes in dioecious species.  
    • A. 

      Chromosomal sex determination (XX-XO, XX-XY, or ZZ-ZW)

    • B. 

      Haplodiploidy

    • C. 

      Genetic sex determination

    • D. 

      Environmental sex determination

    • E. 

      All of the above

  • 28. 
    The sex determination system used by Drosophila is called the ___________system. (2 words)  
  • 29. 
    Male mammals inherit an X chromosome from the maternal parent, the mother.  
    • A. 

      True

    • B. 

      False

  • 30. 
    Species in which an organism has either male or female reproductive structures, but not both are ________.  
  • 31. 
    Human females with XY chromosomes and a mutation in their ____________ receptor gene have androgen-insensitivity syndrome.  
  • 32. 
    Species in which sex is determined by number of chromosome sets—males are haploid, females are diploid, are __________.  
  • 33. 
    Human males, with XY chromosomes are ____________ and produce two different kinds of gametes, while females with XX chromosomes are ______________ and produce only one kind. (answer, asnwer)  
  • 34. 
    The following shows a boy’s karyotype. How many Barr bodies (condensed X chromosomes) would you predict in his cells?  
    • A. 

      One per cell

    • B. 

      Two per cell

    • C. 

      Three per cell

    • D. 

      None

  • 35. 
    • A. 

      7,7 (fingerprint would show just 7)

    • B. 

      14, 14 (fingerprint would show 14)

    • C. 

      7, 14

    • D. 

      7, 5

    • E. 

      5, 14

    • F. 

      All of the above

  • 36. 
    The following shows a boy’s karyotype. Describe the inheritance of each possible combination of your answer to the previous question, including the parent and meiotic stage in which an unusual event occurred.    
    • A. 

      Nondisjunction in meiosis I: Homologs fail to segregate (e.g., X5 and Y or X7 and X14).

    • B. 

      Nondisjunction in meiosis II: Sister chromatids fail to separate (e.g., X7 and X7, or X14 and X14, or both).

    • C. 

      Neither A or B

    • D. 

      Both A & B

  • 37. 
    The boy has an X-linked recessive condition that is not seen in either parent. With this additional information, what can you conclude about the allelic composition of his parents and how he got this karyotype?  
    • A. 

      His mother must be a carrier of the allele for the condition because she passed it to the son without showing it herself. The father could not have been a carrier because he did not show the condition. If the son has the recessive condition, the recessive allele must be on both his X chromosomes. Therefore, the son’s two X chromosomes are the same and were inherited from his mother. The nondisjunction occurred in the mother’s germline, in meiosis II, when sister chromatids failed to separate.

    • B. 

      Not listed

  • 38. 
    In humans, the presence of the SRY gene, normally on Y, determines maleness. In Drosophila, an X: A (autosome) ratio of 0.5 determines maleness.  Explain the genders of human and Drosophila XXY individuals.  
    • A. 

      An XXY human is male. The SRY on the Y chromosome determines maleness, in spite of the two X chromosomes. An XXY Drosophila is female. Drosophila is diploid, so there are two of each autosome. If there are two X chromosomes, the X:A ratio is 1.0, which is a female.

    • B. 

      Not listed

  • 39. 
    In humans, the presence of the SRY gene, normally on Y, determines maleness. In Drosophila, an X: A (autosome) ratio of 0.5 determines maleness. Explain the genders of human and Drosophila XO individuals  
    • A. 

      An XO human is female. In the absence of SRY from a Y chromosome, the person will develop as a female, in spite of having only one X chromosome. An XO Drosophila is male. Drosophila is diploid, so there are two of each autosome. If there is a single X chromosome, the X:A ratio is 1/2, or 0.5, which is a male.

    • B. 

      Not listed

  • 40. 
    Calvin Bridges crossed white-eyed females to red-eyed males and found rare red-eyed males and white-eyed females in the progeny. Explain how he used the Drosophila sex determination system and nondisjunction to demonstrate that the gene for red/white eye color is on the X chromosome.  
    • A. 

      Bridges looked at the chromosomes of the rare flies under the microscope and showed that the rare white-eyed females had two X chromosomes and one Y, and the rare red-eyed males had only one sex chromosome. The rare white-eyed females were XwXwY; they were white-eyed because they contained only recessive w alleles, and female because their X:A ratio = 2:2 = 1.0. The rare red-eyed males were X+O; they were red-eyed because of the dominant + allele, and male because their X:A ratio was 1:2 = 0.5. This demonstrated that genes that confer phenotypes were located on chromosomes.

    • B. 

      Not listed