Sickle cell anaemia results from.

1. A chromosomal aberration

2. Non disjunction of autosome

3. A point mutation

4. Blood transfusion reaction

What is the mode of inheritance of phenylketonuria?

1. Autosomal recessive

2. Autosomal dominant

3. Sex linked recessive

4. Sex linked dominant

Failure of cytokinesis after telophase stage of cell divislon results in an increase in a whole set of chromosomes in an organism and, this phenomenon is known as:

1. Aneuploidy

2. Translocation

3. Polyploidy.

4. Inversion

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

Identify the incorrect statement:

(1) In addition to recombination, mutation is another phenomeonon that leads to variation in DNA.

(2) Chromosomal aberrations are commonly observed in cancer cells.

(3) A classical example of a point mutation is sickle cell anaemia.

(4) Non ionising radiations cannot be mutations. 

Pedigree analysis is resorted to for genetic analysis in humans rather than conventional genetic methods because:

I. Choice matings are not possible

II. Number of progeny is limited

Of the two statements:

(1) Only I is correct

(2) Only II is correct

(3) Both I and II are correct

(4) Both I and II are incorrect

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

In a monohybrid cross F₁ progeny resemble neither of the parents. What would be true in this case?

1. The parental traits would not appear in any of the F₂ -progenies

2. The F₂ phenotypic ratio will be different from the F₂ genotypic ratio

3. It could be a case of incomplete dominance

4. The F₂ phenotypic ratio will be similar to any Mendelian monohybrid cross

The two alleles of a gene pair are located on:

1. Homologous sites on homologous chromosomes

2. Heterologous sites on homologous chromosomes

3. Homologous sites on heterologous chromosomes

4. Heterologous sites on heretologous chromosomes

Male heterogamety is not seen in:

1. Humans

2. Melandrium album

3. Birds

4. Fruit fly