Principles of Inheritance and Variation · Question 61

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

Which of the following most appropriately describes haemophilia ?

1. Chromosomal disorder
2. X-linked recessive gene disorder
3. Dominant gene disorder
4. Recessive gene disorder

The mechanism that causes a gene to move from one linkage group to another is called

1. crossing-over
2. translocation
3. duplication
4. inversion

If a colour-blind man marries a woman who is homozygous for normal colour vision, the probability of their son being colour-blind is

1. 0.75
2. 0.5
3. 0
4. 1

A true breeding plant is -

1. produced due to cross-pollination among unrelated plants
2. one that is able to breed on its own
3. near homozygous and produces offspring of its own kind
4. always homozygous recessive in its genetic constitution

The movement of a gene from one linkage group to another is called

1. inversion
2. translocation
3. duplication
4. crossing over