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

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: