Principles of Inheritance and Variation

Thalassemia and sickle cell anemia are caused due to a problem in globin molecule synthesis. Select the correct statement.

1. Both are due to a qualitative defect in globin chain synthesis
2. Thalassemia is due to less synthesis of globin molecules
3. Sickle cell anemia is due to a quantitative problem of globin molecules
4. Both are due to a quantitative defect in globin chain synthesis

The genotypes of a Husband and Wife are IAIB and IAi. Among the blood types of their children, how many different genotypes and phenotypes are possible?

1. 4 genotypes ; 3 phenotypes
2. 4 genotypes ; 4 phenotypes
3. 3 genotypes ; 4 phenotypes
4. 3 genotypes ; 3 phenotypes

A disease caused by an autosomal primary non-disjunction is :

1. Klinefelter's Syndrome
2. Down's Syndrome
3. Turner's Syndrome
4. Sickle Cell Anemia

Which one from those given below is the period for Mendel's hybridisation experiments ?

1. 1870 – 1877
2. 1857 – 1869
3. 1840 – 1850
4. 1856 – 1863

Among the following characters, which one was not considered by Mendel in his experiments on pea?

1. Stem-Tall or dwarf
2. Pod-Inflated or constricted
3. Trichomes-Glandular or non-glandular
4. Seed-Green or yellow

A cell at telophase stage is observed by a student in a plant brought from the field. He tells his teacher that this cell is not like other cells at telophase stage. There is no formation of cell plate and thus the cell is containing more number of chromosomes as compared to other dividing cells. This would result in -

1. Polyteny
2. Aneuploidy
3. Polyploidy
4. Somaclonal variation

Pick out the correct statements :

1. A, B and C only
2. A, C and D only
3. A and D only
4. B and D only

A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the F1 plants were selfed the resulting genotypes were in the ratio of -

1. 3 : 1 :: Tall : Dwarf
2. 1 : 2 : 1 :: Tall heterozygous : Tall homozygous : Dwarf
3. 1 : 2 : 1 :: Tall homozygous : Tall heterozygous : Dwarf
4. 3 : 1 :: Dwarf : Tall

Match the terms in Column-I with their description in Column-II and choose the correct option :

1. (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
2. (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
3. (a)-(ii), (b)-(ii), (c)-(iv), (d)-(iii)
4. (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)

In a testcross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant-type offspring. This indicates

1. Both of the characters are controlled by more than one gene
2. The two genes are linked and present on the same chromosome
3. The two genes are located on two different chromosomes
4. Chromosomes failed to separate during meiosis