Wazari Exam (Iraq Baccalaureate) - Scientific Branch · Biology

Genetics and molecular biology

28 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 28 questions

  1. Two heterozygous tall pea plants (Dd) are crossed. Tall is completely dominant. What fraction of the offspring are short?
  2. A heterozygous tall plant (Dd) is crossed with a short plant (dd). What fraction of the offspring are tall?
  3. Two healthy parents are both carriers (Aa) of an autosomal recessive disease. Their child is healthy. What is the probability that the child is a carrier?
  4. In a cross AaBb x AaBb with independent assortment, what fraction of offspring are aabb?
  5. A woman who carries the allele for X-linked red-green colour blindness marries a man with normal colour vision. What is the probability that a son is colour blind?
  6. A woman who carries the allele for X-linked red-green colour blindness marries a man with normal colour vision. What is the probability that a daughter is colour blind?
  7. In a population in Hardy-Weinberg equilibrium, 1 percent of individuals show a recessive trait. What is the frequency of heterozygous carriers?
  8. In a population in Hardy-Weinberg equilibrium, 4 percent of individuals show a recessive trait. What is the frequency of heterozygous carriers?
  9. In a population in Hardy-Weinberg equilibrium, 9 percent of individuals show a recessive trait. What is the frequency of heterozygous carriers?
  10. In a population in Hardy-Weinberg equilibrium, 16 percent of individuals show a recessive trait. What is the frequency of heterozygous carriers?
  11. In a population in Hardy-Weinberg equilibrium, 36 percent of individuals show a recessive trait. What is the frequency of heterozygous carriers?
  12. In a double-stranded DNA molecule 20 percent of the bases are adenine. What percentage are guanine?
  13. In a double-stranded DNA molecule 35 percent of the bases are adenine. What percentage are guanine?
  14. In a double-stranded DNA molecule 15 percent of the bases are adenine. What percentage are guanine?
  15. A DNA template strand reads 3'-TACGGCATT-5'. What is the mRNA sequence transcribed from it, written 5' to 3'?
  16. A DNA template strand reads 3'-TACCGATTC-5'. What is the mRNA sequence transcribed from it, written 5' to 3'?
  17. A DNA template strand reads 3'-TACAAGCCG-5'. What is the mRNA sequence transcribed from it, written 5' to 3'?
  18. A DNA template strand reads 3'-TACGCTAAA-5'. What is the mRNA sequence transcribed from it, written 5' to 3'?
  19. An mRNA runs from a start codon to a stop codon and contains 300 nucleotides, including the stop codon. How many amino acids are in the polypeptide? (The stop codon does not code for an amino acid.)
  20. An mRNA runs from a start codon to a stop codon and contains 600 nucleotides, including the stop codon. How many amino acids are in the polypeptide? (The stop codon does not code for an amino acid.)
  21. An mRNA runs from a start codon to a stop codon and contains 450 nucleotides, including the stop codon. How many amino acids are in the polypeptide? (The stop codon does not code for an amino acid.)
  22. An mRNA runs from a start codon to a stop codon and contains 150 nucleotides, including the stop codon. How many amino acids are in the polypeptide? (The stop codon does not code for an amino acid.)
  23. Which cell structure is the site of protein synthesis?
  24. Which base is found in RNA but not in DNA?
  25. What is the role of DNA polymerase?
  26. How many chromosomes are in a normal human gamete?
  27. How many chromosomes are in a human cell during the anaphase of mitosis?
  28. What is the main result of meiosis?

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