F₂ generation in a Mendelian cross showed that both genotypic and phenotypic ratios are same as 1:2:1. It represents a case of

• codominance

• dihybrid cross

• monohybrid cross with complete dominance

• monohybrid cross with complete dominance

A human female with Turner's syndrome

• has 45 chromosomes with XO

• has one additional X - chromosome

• exhibits male characters

• exhibits male characters

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

30.

Alleles are 

• different phenotype

• true breeding homozygotes

• different molecular forms of a gene

• different molecular forms of a gene