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NUMERICAL PROBLEMS ON ICSE AND ISC GENETICS

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Sumit Roy
Sri Sri Academy (SSA), Kolkata

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NUMERICAL PROBLEMS ON ICSE & ISC GENETICS 1. What type of children will appear in F1 generation if a colour blind man marries with a normal woman? Gene for colour blindness is Xc and gene for normal vision is Xc+. 2. Gene A is dominant over gene a. What will be the phenotypic ratio in the offspring obtained from the following mating?(a) Aa X aa. (b) Aa X AA. (c) Aa X Aa. 3. In humans pointed eyebrows is dominant over smooth eyebrows. Rahul s father has pointed eyebrows but he and his mother has smooth eyebrows. Predict the following:(a) Give the genotype of Rahul. (b) What will be the genotype of his father and mother? (c) If Rahul marries a woman who is heterozygous, what will be the possible genotype of the offspring in the next generation? State the % probability of having homozygous dominant, homozygous recessive and heterozygous dominant. 4. A haemophilic man marries a normal homozygous woman. What is the probability that their daughter will be haemophilic? 5. In a certain mammal curly hair is dominant over straight hair. In a cross between the two in the F2 generation, three had curly hair and one had straight hair. (a) What would be the genotype of parents? (b) Work out the genetic cross. 6. What happens when a red coloured homozygous Antirrhinum is crossed with a homozygous white coloured plant? Work out the genotype and phenotype. 7. A cross is made between Tall plant with Yellow seeds (TtYy) and a tall plant with green seeds (Ttyy). What proportion of phenotype would be expected in the offspring to be (a) Tall and green (b) Dwarf and green. 8. A man with AB blood group marries a woman of O blood group. Work out the possible genotype and phenotype of the progeny. 9. A heterozygous Smooth seeded and Red flowered pea plant is crossed with homozygous recessive rough seeded white flowered plant. Determine the progeny. 10. A man with blood group A marries a woman with blood group B. Their first child has blood group O. Give their genotype. Also find out what other blood groups will other children bhave of the same couple. 11. Ravi s parents have normal colour vision but his maternal grandfather is colourblind. Gene for colour vision is located on the X chromosome. (a) Work out a cross, showing the percentage of chances of Ravi and his siblings being colour blind. (b) What is the genotype of mother. (c) State the type of inheritance being shown in the above cross. 12. A haemophilic man marries a carrier woman. Obtain phenotypes of offspring using Punnett square.What is Y- linked inheritance? 13. A normal visioned woman marries a normal visioned man. They have a colour blind child.How can it be explained? Use Punnett square to substantiate your answer. 14. In Mirabilis jalapa the red colour of flower is incompletely dominant over white, the heterozygous condition being pink. What will be the phenotype and genotype and their ratios in the following crosses:(a) Red and Pink. (b) White and Pink. (c) Pink and Pink.

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