Page 3 - Assignment- Principles of Inheritance and Variation

(iii) ZZ in birds.
(iv) XO in grasshopper.
8. Mention two differences between Turner’s syndrome and Klinefelter’s syndome.
9. The human male never passes on the gene for haemophilia to his son. Why is it so?
10. Mention four reasons why Drosophila was chosen by Morgan for his experiments in
genetics.
11. Differentiate between point mutation and frameshift mutations.
D. Short Answer Questions-I (3 marks each)

12. A woman with O blood group marries a man with AB blood group
(i) Work out all the possible phenotypes and genotypes of the progeny.
(ii) Discuss the kind of dominance in the parents and the progeny in this case.
13. Explain the cause of Klinefelter’s syndrome. Give any four symptoms shown by sufferer
of this syndrome.
14. In Mendel’s breeding experiment on garden pea, the offspring of F2 generation are
obtained in the ratio of 25% pure yellow pod, 50% hybrid green pods and 25% green
pods State (i) which pod colour is dominant (ii) The Phenotypes of the individuals of F1
generation. (iii) Work out the cross.

E. Long Answer Questions (5 marks each)
15. A dihybrid heterozygous round, yellow seeded garden pea (Pisum sativum) was crossed
with a double recessive plant.
(i) What type of cross is this?
(ii) Work out the genotype and phenotype of the progeny.
(iii) What principle of Mendel is illustrated through the result of this cross?