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CBSE

Subject

Biology
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NEET Biology : Principles of Inheritance and Variation

Multiple Choice Questions

21.

A human female with Turner's syndrome

  • has 45 chromosomes with XO

  • has one additional X - chromosome

  • exhibits male characters

  • exhibits male characters



22.

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



23.

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



24.

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%



25.

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



26.

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



27.

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



28.

Fgeneration 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



29.

Alleles are 

  • different phenotype

  • true breeding homozygotes

  • different molecular forms of a gene

  • different molecular forms of a gene



30.

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



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