Home NEET Botany MCQs NEET Zoology MCQs NEET Syllabus

NEET - 2019 Previous Year Questions



NEET Biology Previous Year Questions - 2019

A gene locus has two alleles A, a. If the frequency of dominant allele A is 0.4 then what will be the frequency of homozygous dominant, heterozygous and homozygous recessive individuals in the population?

NEET-2019 [Principles of Inheritance and Variation] [class-xii ]

  • 0.16 (AA); 0.36 (Aa); 0.48 (aa)
  • 0.16 (AA); 0.48 (Aa); 0.36 (aa)
  • 0.16 (AA); 0.24 (Aa); 0.36 (aa)
  • 0.36 (AA); 0.48(Aa); 0.16 (aa)
  • Correct Option: B  [ 0.16 (AA); 0.48 (Aa); 0.36 (aa) ]

    Remark:

What map unit (Centimorgan) is adopted in the construction of genetic maps?

NEET-2019 [Principles-of-Inheritance-and-Variation] [class-xii ]

  • A unit of distance between two expressed genes, representing 10% cross over
  • A unit of distance between two expressed genes, representing 100% cross over
  • A unit of distance between genes on chromosomes, representing 50% cross over
  • A unit of distance between genes on chromosomes, representing 1% cross over
  • Correct Option: D  [ A unit of distance between genes on chromosomes, representing 1% cross over ]

    Remark:

The frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes was explained by:

NEET-2019 [Principles-of-Inheritance-and-Variation] [class-xii ]

  • T.H. Morgan
  • Alfred Sturtevant
  • Gregor J. Mendel
  • Sutton Boveri
  • Correct Option: B  [ Alfred Sturtevant ]

    Remark:

Select the incorrect statement.

NEET-2019 [Principles of Inheritance and Variation] [class-xii ]

  • In male grasshoppers, 50% of sperms have no sex-chromosome.
  • In domesticated fowls sex of progeny depends on the type of sperm rather than egg.
  • Human males have one of their sex-chromosome much shorter than the other
  • Male fruit fly is heterogametic.
  • Correct Option: B  [ In domesticated fowls sex of progeny depends on the type of sperm rather than egg. ]

    Remark:

Under which of the following conditions will there be no change in the reading frame of following mRNA?
5'AACAGCGGUGCUAUU3'

NEET-2019 [Principles of Inheritance and Variation] [class-xii ]

  • Deletion of GGU from 7th, 8th and 9th positions
  • Insertion of A at G at 4th and 5th positions respectively
  • Deletion of G from 5th position
  • Insertion of G at 5th position
  • Correct Option: A  [ Deletion of GGU from 7th, 8th and 9th positions ]

    Remark:

What is the genetic disorder in which an individual has an overall masculine development, gynaecomastia and is sterile?

NEET-2019 [Principles of Inheritance and Variation] [class-xii ]

  • Edward syndrome
  • Turner's syndrome
  • Klinefelter's syndrome
  • Down's syndrome
  • Correct Option: C  [ Klinefelter's syndrome ]

    Remark:

Purines found both in DNA and RNA are:

NEET-2019 [Molecular-Basis-of-Inheritance] [class-xii ]

  • Adenine and guanine
  • Adenine and thymine
  • Guanine and cytosine
  • Cytosine and thymine
  • Correct Option: A  [ Adenine and guanine ]

    Remark:

Which of the following features of genetic code does allow bacteria to produce human insulin by recombinant DNA technology?

NEET-2019 [Molecular-Basis-of-Inheritance] [class-xii ]

  • Genetic code is not ambiguous
  • Genetic code is nearly universal
  • Genetic code is redundant
  • Genetic code is specific
  • Correct Option: B  [ Genetic code is nearly universal ]

    Remark:

Expressed Sequence Tages (ESTs) refers to:

NEET-2019 [Molecular-Basis-of-Inheritance] [class-xii ]

  • Polypeptide expression
  • DNA polymorphism
  • Novel DNA sequences
  • Genes expressed as RNA
  • Correct Option: D  [ Genes expressed as RNA ]

    Remark:

Match the following genes of the Lac operon with their respective products.

(A)i gene (I)β-galactosidase
(B)z gene (II)Permease
(C)a gene (III)Repressor
(D)y gene (IV)Transacetylase
Select the correct option.

NEET-2019 [Molecular-Basis-of-Inheritance] [class-xii ]

  • (A)-(I), (B)-(III), (C)-(II), (D)-(IV)
  • (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
  • (A)-(III), (B)-(I), (C)-(II), (D)-(IV)
  • (A)-(III), (B)-(IV), (C)-(I), (D)-(II)
  • Correct Option: B  [ (A)-(III), (B)-(I), (C)-(IV), (D)-(II) ]

    Remark: