A colour blind girl is rare because she will be born only when 

(1) Her mother and maternal grand father were colour blind

(2) Her father and maternal grand father were colour blind

(3) Her mother is colour blind and father has normal vision

(4) Parents have normal vision but grand parents were colour blind. 

Which of the following is a recessive trait for a character choosen by Mendel in garden pea?

1. Violet flower color

2. Yellow pod color

3. Axial flower position

4. Tall stem height

Indentify the incorrect statement:

1. Tall plant produce gametes by meiosis and the dwarf plants by mitosis.

2. Only one allele is transmitted to a gamete.

3. The segregation of alleles is a random process.

4. Gametes will always be pure for the trait.

In the case of co-dominance, the F₁ generation resembles:

(1) Dominant parent

(2) Recessive parent

(3) Both the parents

(4) None of the parents

In case of starch synthesis in pea seeds [controlled by B gene], BB homozygotes produce large and round starch grains; bb homozygotes produce smaller and wrinkled starch grains and Heterozygotes produce round seeds of intermediate size. What can be inferred from this observation?

(1) The gene B mutates at a faster rate.

(2) The gene B is easily influenced by the environment

(3) Dominance is not an autonomous feature of a gene or the product that it has information for

(4) Some genes do not follow the law of segregation.

When Morgan hybridised yellow-bodied, white-eyed females to brown-bodied, red-eyed males and intercrossed their F₁ progeny, the F₂ ratio deviated very significantly from the 9:3:3:1 ratio. this can be attributed to the fact that:

(1) The genes are located on X and Y chromosomes

(2) Fruit fly has abnormal chromosomes

(3) The genes are located on the X chromosome

(4) The genes exhibit incomplete dominance

What is incorrect for Hemophilia?

1. In this disease, a single protein that is a part of the cascade of proteins involved in the clotting of blood is affected.

2. In an affected indlvidual a simple cut will result in non-stop bleeding.

3. The heterozygous female (carrier) for haemophilia may transmit the disease to sons.

4. The possibility of a female becoming a haemophilic is extremely rare because mother of such a female has to be hemophilic and the father should be a carrier.

Sickle cell anaemia results from.

1. A chromosomal aberration

2. Non disjunction of autosome

3. A point mutation

4. Blood transfusion reaction

Which of the following is not a feature of Down's Syndrome?

1. It is caused by a non-disjunction in an autosome

2. The affected individual has trisomy of chromosome 21

3. The aflected individual has a characteristic simian palmar crease

4. The mental development of affected individual is normal

Match each item in Column I with one item in Column II and chose your answer from the codes given below:

1. I - v; II - vii; III - iii; IV - i

2. I - iv; II - vi; III - iii; IV - i

3. I - v; II - vi; III - iii; IV - ii

4. I - v; II - vi; III - iii; IV - i