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

Which of the following statements is not true of two genes that show 50% recombination frequency?
1. The genes are tightly linked
2. The genes show independent assortment
3. If the genes are present on the same chromosome, they undergo more than one crossovers in every meiosis
4.The genes may be on different chromosomes

The incorrect statement with regard to Haemophiliais :
1. It is a recessive disease
2. It is a dominant disease
3. A single protein involved in the clotting of blood is affected
4. It is a sex-linked disease

Fruit colour in squash is an example of :
1. Recessive epistasis
2. Dominant epistasis
3. Complementary genes
4. Inhibitory genes

Person with blood group AB is considered as universal recipient because he has:
1.both A and B antigens on RBC but no antibodies in the plasma.
2. both A and B antibodies in the plasma.
3. no antigen on RBC and no antibody in the plasma
4. both A and B antigens in the plasma but no antibodies