The production of gametes by the parents, formation of zygotes, the F₁ and F₂ plants, can be understood from a diagram called:

(1) Punnett square

(2) Net square

(3) Bullet square

(4) Punch square

In a cross between a male and female, both heterozygous for sickle cell anaemia gene, what percentage of the progeny will be diseased?

1. 25%

2. 100%

3. 50%

4. 75%

Experimental verification of the chromosomal theory of inheritance was done by:

(1) Sutton

(2) Boveri

(3) Morgan

(4) Mendel

Select the correct match

1.  Phenylketonuria - Autosomal dominant trait

2.  Sickle cell anemia - Autosomal recessive trait chromosome - 11

3.  Thalassemia - X linked

4.  Haemophilia - Y linked

Identify the wrong statement with reference to the gene 'I' that controls ABO blood groups.

1. A person will have only two of the 3 alleles.

2. When I^A and I^B are present together, they express same type of sugar.

3. Allele 'i' does not produce any sugar.

4. The gene (I) has three alleles. 

How many true-breeding pea plant varieties did Mendel select as pairs, which were similar except in one character with contrasting traits?

Chromosomal theory of inheritance was proposed by :

1. Sutton and Boveri

2. Bateson and Punnet

3. T. H. Morgan

4. Watson and Crick

The number of contrasting characters studied by Mendel for his experiments was :

1. 14

2. 4

3. 2

4. 7

The best example of pleiotropy is:-

1. Skin color

2. Phenylketonuria

3. Colour Blindness

4. ABO Blood group

In Antirrhinum (Snapdragon), a red flower was crossed with a white flower and in F₁ generation, pink flowers were obtained. When pink flowers were selfed, the F₂ generation  showed white, red, and pink flowers. Choose the incorrect statement from the following: