A woman with normal vision, but whose father was colourblind, marries a colourblind man. Suppose that the fourth child of this couple was a boy. This boy

• must have normal colour vision

• will be partially colourblind since he is heterozygous for the colourblind mutant allele

• must be colourblind

• may be colourblind or may be of normal vision

Husband has blood group A and wife has blood group B. What is the blood group of children

• A

• B

• AB

• A, B, AB or 0

Which of the following is not a hereditary disease?

• Cretinism

• Cystic fibrosis

• Thalassaemia

• Haemophilia

de Vries gave his mutation theory on organic evolution while working on

• Althea rosea

• Drosophila melanogaster

• Oenothera lamarckiana

• Pisum sativum

255.

A woman with 47 chromosomes due to three copies of chromosome 21 is characterized by

• Down syndrome

• triploidy

• Turner syndrome

• super femaleness

Kappa particles indicate

• nuclear inheritance

• cytoplasmic inheritance

• mutation

• nucleo-cytoplasmic inheritance

Using imprints from a plate with complete medium and carrying bacterial colonies, you can select streptomycin resistant mutants and prove that such mutations do not originate as adaptation. These imprints need to be used

• only on plates with streptomycin

• on plates with minimal medium

• only on plates without streptomycin

• on plates with and without streptomycin

In order to find out the different types of gametes produced by a pea plant having the genotype AaBb, it should be crossed to a plant with the genotype

• aaBB

• AaBb

• AABB

• aabb

A person who is trisomic for twenty first pair of chromosome suffers from

• Klinefelter's syndrome

• Down's syndrome

• Turner's syndrome

• None of the above

In which blood group antigen are absent

• O

• A

• B

• AB