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:

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:

Which of the following can be used as a biocontrol agent in the treatment of plant disease?

NEET-2019 Microbes-in-Human-Welfare [class-xii ]

• Anabaena
• Chlorella
• Trichoderma
• Lactobacillus
Correct Option: C  [ Trichoderma ]

Remark:

Select the correct group of biocontrol agents.

NEET-2019 Microbes-in-Human-Welfare [class-xii ]

• Bacillus thuringiensis,Tobacco mosaic virus, Aphids
• Oscillatoria, Rhizobium, Trichoderma
• Trichoderma, Baculovirus, Bacillus thuringiensis
• Nostoc, Azospirillium, Nucleopolyhedrovirus
Correct Option: C  [ Trichoderma, Baculovirus, Bacillus thuringiensis ]

Remark:

Following statements describe the characteristics of the enzyme Restriction endonuclease. Identify the incorrect statement.

NEET-2019 Biotechnology-Principles-and-Processes [class-xii ]

• The enzyme binds DNA at specific sites and cuts only one of the two strands.
• The enzyme cuts DNA molecule at identified position within the DNA
• The enzyme cuts the sugar-phosphate backbone at specific sites on each strand.
• The enzyme recognizes a specific palindromic nucleotide sequence in the DNA
Correct Option: A  [ The enzyme binds DNA at specific sites and cuts only one of the two strands. ]

Remark:

Pinus seed cannot germinate and establish without fungal association. This is because:

NEET-2019 Organisms-and-Populations [class-xii ]

• it has obligate association with mycorrhizae.
• its embryo is immature
• it has very hard seed coat.
• its seeds contain inhibitors that prevent germination.
Correct Option: A  [ it has obligate association with mycorrhizae. ]

Remark: