If Mendel might have studied 7 pairs of characters in a plant with 12 chromosomes instead of 14 then:
1. | He could not discover an independent assortment |
2. | He might have discovered linkage |
3. | He might have discovered crossing over |
4. | He might have not observed dominance |
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
Mental retardation in man occurs due to:
1. Loss of one X chromosome
2. Addition of one X chromosome
3. Slight growth in Y
4. Overgrowth in Y
ABO blood group has:
1. Two codominant and one recessive allele
2. Two codominant and two recessive allele
3. Two incompletely dominant genes
4. Two pseudo alleles