Which of the following is not true for the Law of Dominance given by Mendel?

1.	Characters are controlled by discrete units called factors.
2.	Factors occur in pairs.
3.	In a dissimilar pair of factors one member of the pair dominates the other.
4.	The alleles show blending at the time of fertilization

A heterozygous plant produces:
1. Only one kind of gamete

2. Two kinds of gametes each having one allele with equal proportion.

3. Two kinds of gametes each having two alleles with equal proportion.

4. Two kinds of gametes each having one allele with one allele occurring in more gametes than the other.

What is the F₂ phenotypic ratio in cases of incomplete dominance?
1. 1 : 1

2. 3 : 1

3. 1 : 2 : 1

4. 1 : 1

Blood group antigens are:
1. Carbohydrates present in plasma
2. Carbohydrates present on the surface of RBCs
3. Plasma proteins
4. Proteins present on the surface of RBCs

What can be the blood groups of progeny whose father and mother are of AB and O blood group respectively?
1. A and B only

2. AB only

3. All except O

4. A, B, AB and O

To study whether a gene exhibits multiple allelism or not one must study:
1. An individual
2. A population
3. A species
4. With concentration

‘When two pairs of traits are combined in a hybrid, segregation of one pair of characters is independent of the other pair of characters’. This is the statement of:

1. Law of Dominance

2. Law of segregation

3. Law of Independent Assortment

4. Law of Linkage

During his observation of spermatogenesis in a few insects, Henking found that a nuclear structure was received by 50 % of the sperms. What did he call this structure?

1. X – body

2. Y – body

3. X – chromosome

4. Y – chromosome

Mendelian disorders are mainly determined by:
1. Alteration or mutation in a single gene.
2. Chromosomal gross structural changes.
3. Recombination between linked genes.
4. Jumping genes

The point mutation leading to sickle cell anaemia occurs:

1. at sixth position in the beta chain of haemoglobin
2. at sixth position in the alpha chain of haemoglobin
3. at sixth position in the beta chain of myoglobin
4. at sixth position in the alpha chain of myoglobin