Which one of the following is a wrong statement regarding mutations?

• Deletion and insertion of base pairs cause frame-sheft mutations

• Cancer cells commonly show chromosomal aberrations

• UV and Gamma rays are mutagens

• UV and Gamma rays are mutagens

A test cross is carried out to

• determine the genotype of a plant at F₂

• predict whether two traits are linked

• assess the number of alleles of a gene

• assess the number of alleles of a gene

A man whose father was colour blind marries a woman, who had a colourblind mother and normal father. What percentage of male children of this couple will be colourblind.

• 25%

• 0%

• 50%

• 50%

The idea of mutations was brought forth by

• Hugo de Vries, who worked on evening primrose

• Gregor Mendel, who worked on Pisum sativum

• Hardy Weinberg, who worked on allele frequencies in a population

• Hardy Weinberg, who worked on allele frequencies in a population

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?

• Phenylketonuria

• Sickle cell anaemia

• Haemophilia

• Haemophilia

Multiple alleles are present

• On different chromosomes

• At different loci on the same chromosome

• at the same locus of the chromosome

• at the same locus of the chromosome

An abnormal human baby with 'XXX' sex chromosomes was born due to

• formation of abnormal sperms in the father

• formation of abnormal ova in the mother

• fusion of two ova and one sperm

• fusion of two ova and one sperm

Alleles are 

• different phenotype

• true breeding homozygotes

• different molecular forms of a gene

• different molecular forms of a gene

169.

A person with unknown blood group under ABO system has suffered much blood loss in an accident and needs an immediate blood transfusion. His one friend who has a valid certificate of his own blood type offers for blood donation without delay. What would have been the type of blood group of the donor friend?

• Type AB

• Type O

• Type A

• Type A

Which one of the following conditions correctly describes the manner of determining the sex in the given samples?

• XO type of sex chromosomes determine male sex in grasshopper

• XO condition in humans as found in Turner syndrome determines female sex

• Homozygous sex chromosomes (XX) produce male in Drosophila

• Homozygous sex chromosomes (XX) produce male in Drosophila