MDCAT Pakistan · Biology

Genetics, Inheritance and Molecular Biology

9 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 9 questions

  1. In a dihybrid cross between two heterozygous pea plants (RrYy x RrYy), what fraction of the offspring is expected to be homozygous dominant for both traits (RRYY)?
  2. In a human population in Hardy-Weinberg equilibrium, the frequency of an autosomal recessive allele (q) is 0.20. What percentage of the population is expected to be heterozygous carriers (2pq)?
  3. A father with normal vision and a carrier mother (X^C X^c) have children. What is the probability that their first son will be red-green color blind?
  4. Which molecular diagnostic technique uses reverse transcriptase followed by thermal cycles of denaturation, annealing, and elongation to detect viral RNA genomes?
  5. What is the genetic mechanism that produces Klinefelter syndrome in humans?
  6. Which type of restriction endonuclease cleaves DNA at specific palindromic recognition sequences without requiring ATP hydrolysis?
  7. In a pedigree analysis, a rare disease affects only males, and all daughters of an affected father are unaffected carriers while sons never inherit the trait from their father. What is the mode of inh…
  8. During translation elongation, which ribosomal site receives the incoming aminoacyl-tRNA guided by elongation factor EF-Tu?
  9. What term describes the phenomenon where a single gene influences multiple unrelated phenotypic characteristics in an organism?

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