Page 2 - Assignment- Principles of Inheritance and Variation

1. Genotype
2. Phenotype
3. Trait
4. None of the above

8. A man marries a woman and both do not show any apparent traits of inherited disease. Five sons
and two daughters are born, and three of their sons suffer from a disease. However, none of the
daughters is affected. The following mode of inheritance for the disease is

1. Sex-linked recessive
2. Sex-linked dominant
3. Autosomal dominant
4. None of the above

9. A trait that “overpowers” and hide another trait is called

1. Overpowering trait
2. Complex trait
3. Recessive trait
4. Dominant Trait

10. Why is haemophilia a disease that is more commonly seen in males?

1. Both (2) and (3)
2. The disease is Y- linked
3. The disease is X- linked
4. None of the above

B. Very Short Answer Questions (1 mark each)
1. Give any two reasons for the selection of pea plants by Mendel for his experiments.
2. Name any one plant that shows the phenomenon of incomplete dominance during the
inheritance of its flower colour.
3. Name the base change and the amino acid change, responsible for sickle cell anaemia.
4. Name the disorder with the following chromosome complement.
(i) 22 pairs of autosomes + X X Y
(ii) 22 pairs of autosomes + 21st chromosome + XY.
5. A haemophilic man marries a normal homozygous woman. What is the probability that
their daughter will be haemophilic?
6. A test is performed to know whether the given plant is homozygous dominant or
heterozygous. Name the test and phenotypic ratio of this test for a monohybrid cross.

C. Short Answer Questions-II (2 marks each)
7. Identify the sex of organism as male or female in which the sex chromosome are found as:
(i) ZW in bird
(ii) XY in Drosophila