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

If a female having gene for haemophilia and colour-blindness on one X-chromosome marries a normal male, then what are the chances in their offspring?
1. 50% sons diseased and 50% normal
2. All normal offspring
3. 100% daughters are carrier
4. 100% sons diseased

First child of a normal male and female is albino, what are the chances of second child being albino:
1.  25%
2.  50%
3.  75%
4.  100%

Point mutation is induced by:
1. Adenine
2.  Guanine
3.  3-cytosine
4.  5-bromouracil

Reason for trisomy in Down's syndrome is:
1.  Non-disjunction during sperm formation
2.  Non-disjunction during egg formation
3.  Non-disjunction at the time of egg or sperm formation
4.  Addition of one extra chromosome during mitosis

Multivalent chromosome is formed by:
1.  Inversion
2.  Deletion
3.  Reciprocal translocation
4.  Point mutation

A normal leaf cell has how many genomes?
1.   1
2.   2
3.   3
4.   4