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 do you suggest for this disease?

• Autosomal dominant

• Sex-linked dominant

• Sex-limited recessive

• Sex-linked recessive

112.

A haemophilic woman marries a normal man then

• all the children will be normal

• all the sons will be haemophilic

• all the girls will be haemophilic

• half girls will be haemophilic

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

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