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Explore popular questions from Genetics and Evolution for NEET. This collection covers Genetics and Evolution previous year NEET questions hand picked by experienced teachers.

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Q 1. A woman with two genes for haemophilia and one gene for colour blindness on one of the {tex} ^ { \prime } \mathrm { X } ^ { \prime } {/tex} chromosomes marries a normal man. How willthe progeny be{tex}?{/tex}

A

50{tex} \% {/tex} haemophilic colour-blind sons and 50{tex} \% {/tex} normal sons

50{tex} \% {/tex} haemophilic daughters (carrier) and 50{tex} \% {/tex} colour blind daughters (carrier)

C

All sons and daughters haemophilic and colour-blind

D

Haemophilic and colour-blind daughters

Explanation



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Q 2. {tex}E.coli{/tex} cells with a mustard {tex}z{/tex} gene of the {tex}lac{/tex} operon cannot grow in medium containing only lactose as the source of energy because

A

the {tex} lac {/tex} operon is constitutively active in these cells

they cannot synthesize functional beta galactosidase

C

in the presence of glucose, {tex}E.coli{/tex} cells do not utilize lactose

D

they cannot transport lactose from the medium into the cell.

Explanation

The Z gene in the structural genes of the lactose operon codes for Beta-galactosidase. A mutation in the Z-gene causes inability in the synthesis of beta-galactosidase. Hence, lactose cannot be broken down into glucose and galactose. so the correct answer is 'B'"

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Q 3. ABO blood group system is due to

A

multifactor inheritance

B

incomplete dominance

Codominance

D

epistasis.

Explanation


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Q 4. Pick out the correct statements.
(1) Haemophilia is a sex-linked recessive disease.
(2) Down's syndrome is due to aneuploidy
(3) Phenylketonuria is an autosomal recessive gene disorder
(4) Sickle cell anaemia is an X-linked recessive gene disorder.

A

(1) , (3) and (4) are correct.

(1) , ( 2) and (3) are correct.

C

(1) and (4) are correct.

D

(2) and ( 4 ) are correct.

Explanation


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Q 5. Which antibiotic inhibits interaction between {tex}t {/tex}RNA and {tex} m {/tex}RNA during bacterial protein synthesis ?

Tetracycline

B

Erythromycin

C

Neomycin

D

Streptomycin

Explanation


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Q 6. The diagram shows an important concept in the genetic implication of DNA.Fill in the blanks A to C.

A - Transcription, B - Translation, C - Francis Crick

B

A-Translation, B - Extension, C - Rosalind Franklin

C

A-Transcription, B-Replication, C - James Watson

D

A - Translation, B - Transcription, C - Ervin Chargaff

Explanation


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Q 7. Which one of the following sequences was proposed by Darwin and Wallace for organic evolution{tex}?{/tex}

A

Overproduction, variations, constancy of population size, natural selection

B

Variations, constancy of population size, overproduction, natural selection

Overproduction, constancy of population size, variations, natural selection

D

Variations, natural selection, overproduction, constancy of population size

Explanation


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Q 8. Which one of the following options gives one correct example each of convergent evolution and divergent evolution{tex}?{/tex}

{tex} \begin{array} { l l } { \text { Convergent } } &&&& { \text { Divergent } } \\ { \text { evolution } } &&&& { \text { evolution } } \\ \\ { \text { Eyes of octopus } } &&&& { \text { Bones of forelimbs } } \\ { } &&&& { \text { of mammals and } } \\ { } &&&& { \text { vertebrates } } \end{array} {/tex}

B

{tex} \begin{array} { l l } { \text { Thorns of \ Bougainvillea } } &&& { \text { Wings of} }\\ { \text { and tendrils of } } &&& { \text { butterflies } } \\ { \text \ { Cucurbita } } &&& { \text { and bird } } \end{array} {/tex}

C

{tex} \begin{array} { l l } { \text { Bones of forelimbs } } &&& { \text { Wings of butterfly } } \\ { \text { of vertebrates } } &&& { \text { and birds } } \end{array} {/tex}

D

{tex} \begin{array} { l l } { \text { Thorns of \ Bougainvillea } } &&& { \text { Eyes of ectopus} }\\ { \text { and tendrils of } } &&& { \text { and mammals} } \\ { \text \ { Cucurbita } } \end{array} {/tex}

Explanation


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Q 9. On selfing a plant of {tex} \mathrm { F }_1 {/tex}- generation with genotype "AABbCC", the genotypic ratio in {tex} \mathrm { F } _ { 2 } {/tex} - generationwill be

{tex} 3 : 1 {/tex}

B

{tex} 1 : 1 {/tex}

C

{tex} 9 : 3 : 3 : 1 {/tex}

D

{tex} 27 : 9 : 9 : 9 : 3 : 3 : 3 : 1 {/tex}.

Explanation


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Q 10. ABO blood groups in humans are controlled by the gene {tex}I{/tex}. It has three alleles - {tex}I^A{/tex} , {tex}I^B{/tex} and {tex}i{/tex}. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur?

A

Three

B

One

Four

D

Two

Explanation



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Q 11. Which one of the following is incorrect about the characteristics of protobionts (coacervates and microspheres) as envisaged in the abiogenic origin of life{tex}?{/tex}

A

They were partially isolated from the surroundings.

B

They could maintain an internal environment

They were able to reproduce.

D

They could separate combinations of molecules from the surroundings.

Explanation



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Q 12. Exon part of {tex} m {/tex}RNA have code for

protein

B

lipid

C

carbohydrate

D

phospholipid.

Explanation


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Q 13. Half life period of {tex} \mathrm { C } ^ { 14 } {/tex} is approx

A

500 years

5500 years

C

50 years

D

{tex} 5 \times 10 ^ { 4 } {/tex} years.

Explanation


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Q 14. Which of the following amino acids was not found to be synthesized in Miller's experiment{tex}?{/tex}

A

Alanine

B

Glycine

C

Aspartic acid

Glutamic acid

Explanation


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Q 15. Common origin of man and chimpanzee is best shown by

A

binocular vision

chromosome number

C

dental formula

D

cranial capacity.

Explanation


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Q 16. If the DNA codons are ATG ATG ATG and a cytosine base is inserted at the beginning, then which of the following will result ?

CAT GAT GATG

B

A non-sense mutation

C

C ATG ATG ATG

D

CA TGA TGA TG

Explanation


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Q 17. Which of the following is the relatively most accurate method for dating of fossils{tex}?{/tex}

A

Radio-carbon method

B

Potassium-argon method

Electron-spin resonance method

D

Uranium-lead method

Explanation



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Q 18. Two nonallelic genes produces the new phenotype when present together but fail to do so independently then it is called

A

epistasis

B

polygene

C

non complementary gene

complementary gene.

Explanation


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Q 19. Ribosomal RNA is actively synthesized in

A

lysosomes

nucleolus

C

nucleoplasm

D

ribosomes.

Explanation


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Q 20. Sickle-cell anaemia is

A

caused by substitution of valine by glutamic acid in the beta globin chain of haemoglobin

caused by a change in a single base pair of DNA

C

characterized by elongated sickle like RBCs with a nucleus

D

an autosomal linked dominant trait.

Explanation


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Q 21. Sequence of which of the following is used to know the phylogeny{tex}?{/tex}

A

{tex} m \mathrm { R } \mathrm { N } \mathrm { A } {/tex}

{tex} r \mathrm { R } \mathrm { N } \mathrm { A } {/tex}

C

{tex} t \mathrm { RN } \mathrm { A } {/tex}

D

{tex} \mathrm {DNA} {/tex}

Explanation


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Q 22. Genetic drift is change of

A

gene frequency in same generation

B

appearance of recessive genes

gene frequency from one generation to next

D

none of the above.

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Q 23. Which evidence of evolution is related to Darwin's finches{tex}?{/tex}

Evidences from biogeographical distribution

B

Evidences from comparative anatomy

C

Evidences from embryology

D

Evidences from paleontology

Explanation


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Q 24. A male human is heterozygous for autosomal genes {tex} A {/tex} and {tex} B {/tex} and is also hemizyous for haemophilic gene h. What proportion of his sperms will be ab ?

1{tex} / 8 {/tex}

B

1{tex} / 32 {/tex}

C

1{tex} / 16 {/tex}

D

1{tex} / 4 {/tex}

Explanation


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Q 25. Who is directly related to man{tex}?{/tex}

Gorilla

B

Rhesus

C

Gibbon

D

Orangutan