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NEET Botany PYQs
Class XI & Class XII
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🧬 Botany
📘 Class XI & XII
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408 questions in Botany
What map unit (Centimorgan) is adopted in the
construction of genetic maps?
A
A unit of distance between two expressed genes,
representing 10% cross over
B
A unit of distance between two expressed genes,
representing 100% cross over
C
A unit of distance between genes on chromosomes, representing 50% cross over
D
A unit of distance between genes on chromosomes, representing 1% cross over
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Explanation: In NCERT, one map unit is a centimorgan, which corresponds to a 1% recombination frequency between two genes on a chromosome. So, the distance between two genes is measured by the percentage of offspring showing recombination. A 1% recombination means a 1 cM distance. The correct option is 4: 1% cross over.
🧠Did You Know? Recombination frequency cannot exceed 50% for genes that are linked; 50% or more indicates genes behave as if on different chromosomes (independent assortment).
💡 NCERT Memory Line: A centimorgan (cM) is the unit of map distance; 1 cM equals 1% recombination between two genes.
The frequency of recombination between gene pairs
on the same chromosome as a measure of the
distance between genes was explained by:
A
T.H. Morgan
B
Alfred Sturtevant
C
Gregor J. Mendel
D
Sutton Boveri
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Purines found both in DNA and RNA are:
A
Adenine and guanine
B
Adenine and thymine
C
Guanine and cytosine
D
Cytosine and thymine
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Which of the following features of genetic code does allow bacteria to produce human insulin by
recombinant DNA technology?
A
Genetic code is not ambiguous
B
Genetic code is nearly universal
C
Genetic code is redundant
D
Genetic code is specific
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Expressed Sequence Tages (ESTs) refers to:
A
Polypeptide expression
B
DNA polymorphism
C
Novel DNA sequences
D
Genes expressed as RNA
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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.
A
(A)-(I), (B)-(III), (C)-(II), (D)-(IV)
B
(A)-(III), (B)-(I), (C)-(IV), (D)-(II)
C
(A)-(III), (B)-(I), (C)-(II), (D)-(IV)
D
(A)-(III), (B)-(IV), (C)-(I), (D)-(II)
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Which of the following can be used as a biocontrol
agent in the treatment of plant disease?
A
Anabaena
B
Chlorella
C
Trichoderma
D
Lactobacillus
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Select the correct group of biocontrol agents.
A
Bacillus thuringiensis,Tobacco mosaic virus,
Aphids
B
Oscillatoria, Rhizobium, Trichoderma
C
Trichoderma, Baculovirus, Bacillus thuringiensis
D
Nostoc, Azospirillium, Nucleopolyhedrovirus
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Following statements describe the characteristics of the enzyme Restriction endonuclease. Identify the
incorrect statement.
A
The enzyme binds DNA at specific sites and cuts
only one of the two strands.
B
The enzyme cuts DNA molecule at identified
position within the DNA
C
The enzyme cuts the sugar-phosphate backbone
at specific sites on each strand.
D
The enzyme recognizes a specific palindromic
nucleotide sequence in the DNA
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Pinus seed cannot germinate and establish without
fungal association. This is because:
A
it has obligate association with mycorrhizae.
B
its embryo is immature
C
it has very hard seed coat.
D
its seeds contain inhibitors that prevent
germination.
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