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1.6 Mendelian Genetics, Probability & Blood Groups โ Test 3
Q1. When the F1 of a monohybrid cross is self-fertilised, the expected F2 phenotypic ratio is:โ 3:1
Q2. Mendel's monohybrid ratio is a direct consequence of:โ Separation of homologous chromosomes during meiosis
Q3. The typical F2 phenotypic ratio of a Mendelian dihybrid cross is:โ 9:3:3:1
Q4. A cross between homozygous dominant purple (PP) and homozygous recessive white (pp) gives an F1 that is:โ All purple
Q5. In a test cross, the F1 (or an individual of unknown genotype) is crossed with a:โ Homozygous recessive individual
Q6. Mendel's law of independent assortment corresponds to the arrangement of chromosomes at:โ Metaphase I of meiosis
Q7. If a plant of genotype AaBb (genes unlinked) is self-pollinated, the probability of an AABB offspring is:โ 1/16
Q8. The number of genetically different gametes an individual of genotype AaBbCcDdEeFfGg can produce is:โ 128
Q9. Mendel's laws of inheritance apply primarily to:โ Nuclear genes
Q10. An Rhโบ man married to an Rhโป woman can have children who are:โ Either Rhโบ or Rhโป
Q11. A cross between a pure-breeding red-flowered plant and a pure-breeding white-flowered plant (one gene) is a:โ Monohybrid cross
Q12. When two dice are thrown together, the probability of getting a sum of 9 is:โ 1/9
Q13. A plant of genotype AaBbCc (three independent genes) is selfed. The probability that an offspring shows the dominant phenotype for at least one of the three traits is:โ 63/64
Q14. Assuming a 1:1 sex ratio, the probability that three children of the same parents are two daughters and one son is:โ 0.375
Q15. From a 3:1 (tall:dwarf) F2, the probability that of three randomly chosen plants, two are dwarf and one is tall, is:โ 9/64
Q16. Two siblings each inherit half their genome from each parent yet differ phenotypically. The event during gametogenesis that contributes most to this difference is:โ Independent assortment (and recombination)
Q17. The blood-group A antigen differs from the H antigen of group O individuals by the presence of a terminal:โ N-acetylgalactosamine
Q18. A mother with blood group O has a child with blood group A. The father could be of blood type:โ A or AB
Q19. Mendel's alleles for his different traits all showed:โ Dominance and recessiveness
Q20. Match each cross/term with its expected outcome and select the correct option.โ A-iv, B-ii, C-i, D-iii