A certain road accident patient with unknown blood group needs immediate blood transfusion. His one doctor friend at once offers his blood. What was the blood group of the donor?
1. Blood group B
2. Blood group AB
3. Blood group O
4. Blood group A

A normal-visioned man whose father was colour-blind, marries a woman whose father was also colour-
blind. They have their first child as a daughter. What are the chance that this child would be colour–blind?

Represented below is the inheritance pattern of a certain type of traits in humans. Which one of the following conditions could be an example of this pattern?

Which one of the following is a wrong statement regarding mutations?
1. Deletion and insertion of base pairs cause frame-shift mutations
2. Cancer cells commonly show chromosomal aberrations
3. UV and Gamma rays are mutagens
4. Change in a single base pair of DNA does not cause mutation

F₂ generation in a Mendelian cross showed that both genotypic and phenotypic ratios are same as 1 : 2 : 1 It represents a case of :
1. Co-dominance
2. Dihybrid cross
3. Monohybrid cross with complete dominance
4. Monohybrid cross with incomplete dominance

A test cross is carried out to:
1. Determine the genotype of a plant at F2.
2. Predict whether two traits are linked.
3.Assess the number of alleles of a gene.
4. Determine whether two species or varieties will breed successfully.

The idea of mutations was brought forth by:
1. Hugo de Vries, who worked on evening primrose
2. Gregor Mendel, who worked on Pisumsativum
3. Hardy Weinberg, who worked on allele frequencies in a population
4. Charles Darwin, who observed a wide variety of organisms during sea voyage
 

If two persons with 'AB' blood group marry and have a sufficiently large number of children, these children could be classified as 'A' blood group: 'AB' blood group: 'B'blood group in a 1:2:1 ratio. The modern technique of protein electrophoresis reveals the presence of both' A' and 'B' type proteins in 'AB' blood group individuals. This is an example of:

If both parents are carrier for thalessemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child ?
1. 50%
2. 25 %
3. 100%
4. no chance

Which Mendelian idea is depicted by a cross in which the F1 generation resembles both the parents?
1. law of dominance
2. inheritance of one gene
3. co-dominance
4. incomplete dominance