The salivary gland chromosomes in the dipteran larva, are useful in gene mapping because:

1.	They have endoreduplication chromosomes
2.	These are fused
3.	These are easy to stain
4.	These are much longer in size

In order to find out the different types of gametes produced by a pea plant having the genotype AaBb, it should be crossed to a plant with the genotype:

1. AaBb

2. aabb

3. AABB

4. aaBB

Which of the following is not a hereditary disease:

1. Haemophilia

2. Cretinism

3. Cystic fibrosis

4. Thalasasemia 

A woman with normal vision, but whose father was colour blind, marries a colour blind man. Suppose that the fourth child of this couple was a boy. This boy:
 

Haemophilia is more commonly seen in human males than in human females because:

A woman with 47 chromosomes, due to three copies of chromosome 21, is characterized by:

A man and a woman, who do not show any apparent signs of a certain inherited disease, have seven children (2 daughters and 5 sons). Three of the sons suffer from the given disease but none of the daughters are affected. Which of the following mode of inheritance might be the reason for this disease?

1. Sex-limited recessive

2. Autosomal dominant

3. Sex-linked recessive

4. Sex-linked dominant

Genes for cytoplasmic male sterility in plants are generally located in:

1. Nuclear genome

2. Chloroplast genome

3. Cytosol

4. Mitochondrial genome

If Mendel might have studied 7 pairs of characters in a plant with 12 chromosomes instead of 14 then:

AA Bb Cc genotypes form how many types of gametes?
1.  4
2.  8
3.  2
4.  6