In which of the following one may observe variation in DNA?

1. Fragmentation

2. Budding

3. Amitosis

4. mutation

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

Cystic fibrosis, Myotonic dystrophy and Thalassemia are

1. Chromosomal disorders

2. Autosomal recessive disorders

3. Mendelian disorders

4. Autosomal dominant disorders

Which of the following is not a hereditary disease?

1. Haemophilia. 

2. Cretinism. 

3. Cystic fibrosis. 

4. Thalassemia.

Two phenotypically normal individuals have an affected child. What can we conclude about the parents?

1. they both carried the diesease allele

2. they are not the parents of the child

3. they are affected

4. no conclusions can be drawn

Which one of the following traits are controlled by genes located on the differential part of X-chromosome?

1. Porcupine skin and epidermolysis bullosa

2. Beard in man and milk glands in female

3. Color blindness and hemophilia

4. Color blindness and cystic fibrosis

How many diseases in the list given below are Mendelian disorders?

1.  Four

2.  Five

3.  Six

4.  Seven 

Which of the following occurs due to the presence of autosome linked dominant trait?

In Phenylketonuria,

1. Only I is correct
2. Only II is correct
3. Both are correct
4. Both are incorrect