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GENETICS MCQs

Total Questions : 21 | Page 2 of 3 pages
Question 11. What does heterozygous mean?
  1.    An organism that has the same genes for a trait (TT or tt)
  2.    An organism that has different genes for a trait (Tt)
  3.    When neither gene is fully dominant; offspring is a mixture of both
  4.    the different forms of a trait (hair color--> brown, blonde, red
 Discuss Question
Answer: Option B. -> An organism that has different genes for a trait (Tt)
Question 12. How many chromosomes are in a sex cell?
  1.    46
  2.    23
  3.    26
  4.    43
 Discuss Question
Answer: Option B. -> 23
Question 13. Aa is
  1.    homozygous (purebred)
  2.    heterozygous (hybrid)
 Discuss Question
Answer: Option B. -> heterozygous (hybrid)
Question 14. Which of the following genotypes is homozygous dominant?
  1.    A
  2.    Aa
  3.    AA
  4.    aa
 Discuss Question
Answer: Option C. -> AA
Question 15. How many human genetic disorders are known?
  1.    1
  2.    100
  3.    Thousands
  4.    None
 Discuss Question
Answer: Option C. -> Thousands
Question 16. What is the study of heredity?
  1.    genetics
  2.    cell biology
  3.    chemistry
  4.    botany
 Discuss Question
Answer: Option A. -> genetics
Question 17. Which of the following is a phenotype?
  1.    Aa
  2.    red hair
  3.    heterozygous genes
  4.    mutated DNA
 Discuss Question
Answer: Option B. -> red hair
Question 18. How many pairs of chromosomes exist in each of your cells?
  1.    10
  2.    12
  3.    23
  4.    46
 Discuss Question
Answer: Option C. -> 23
Question 19. Why are your chromosomes arranged in pairs?
  1.    Scientists have no idea
  2.    Because you get one from your mom and one from your dad
  3.    Because pairs can divide easier
  4.    Because DNA is awesome
 Discuss Question
Answer: Option B. -> Because you get one from your mom and one from your dad
Question 20. What is the relationship between DNA and chromosomes?
  1.    Chromosomes are made of DNA
  2.    DNA is made of chromosomes
  3.    DNA and chromosomes are the same thing.
  4.    All of the above are correct
 Discuss Question
Answer: Option A. -> Chromosomes are made of DNA

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