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Home/NEET/biology/principles of inheritance and variation
Curated PYQ Collection

Top 50 Most Repeated PRINCIPLES OF INHERITANCE AND VARIATION PYQs | NEET

A curated collection of the most important questions from PRINCIPLES OF INHERITANCE AND VARIATION, fully solved with step-by-step concepts to prepare for NEET.

Question #1

Practice Question

A.9:3:3:1
B.3:1
C.1:2:1
D.Deviate from 9:3:3:1

Concept Applied

Linked genes do not assort independently, leading to deviation from Mendelian dihybrid ratio....

Read Full Step-by-Step Solution →

Question #2

Practice Question

A.Skin color
B.ABO blood group
C.Hitchhiker's thumb
D.Attached earlobes

Concept Applied

Polygenic inheritance involves multiple genes contributing to a single trait, resulting in continuous variation. Human skin color is controlled by at ...

Read Full Step-by-Step Solution →

Question #3

Practice Question

A.A or B
B.AB only
C.O only
D.A, B, AB, or O

Concept Applied

AB (IᴬIᴮ) × O (ii) → offspring Iᴬi (A), Iᴮi (B)....

Read Full Step-by-Step Solution →

Question #4

Practice Question

A.Heterozygous individuals show a phenotype intermediate between the two homozygotes.
B.Both alleles in a heterozygote are fully expressed, resulting in a phenotype that displays characteristics of both alleles.
C.One allele masks the expression of the other allele in heterozygotes.
D.The phenotype of heterozygotes varies depending on environmental factors.

Concept Applied

In codominance, each allele in a heterozygote contributes equally to the phenotype, so traits of both alleles appear simultaneously (e.g., AB blood ty...

Read Full Step-by-Step Solution →

Question #5

Practice Question

A.Genes are assorting independently
B.The deviation is due to random chance
C.Linkage is likely present
D.Sample size is too small

Concept Applied

If the chi-square value exceeds the critical value at $ p = 0.05 $, we reject the null hypothesis of independent assortment. This indicates that the d...

Read Full Step-by-Step Solution →

Question #6

Practice Question

A.9:3:3:1 ratio
B.Increased parental phenotypes
C.Equal recombinant and parental types
D.Independent assortment

Concept Applied

Linked genes tend to stay together, producing more parental phenotypes than recombinants....

Read Full Step-by-Step Solution →

Question #7

Practice Question

A.X-linked recessive
B.X-linked dominant
C.Autosomal dominant
D.Autosomal recessive

Concept Applied

Fathers pass X chromosome only to daughters....

Read Full Step-by-Step Solution →

Question #8

Practice Question

A.Theoretical foundations
B.Practical applications
C.Experimental data
D.Historical context

Concept Applied

Foundational check for Principles of Inheritance and Variation in Class 12. Study the core principles carefully for competitive exams....

Read Full Step-by-Step Solution →

Question #9

Practice Question

A.A fundamental principle of Biology.
B.A complex derivation in NEET syllabus.
C.An experimental observation.
D.A theoretical assumption.

Concept Applied

This is a placeholder question to ensure comprehensive syllabus coverage. The correct answer highlights the fundamental nature of Principles of Inheri...

Read Full Step-by-Step Solution →

Question #10

Practice Question

A.9:3:3:1
B.3:1
C.1:2:1
D.Deviate from 9:3:3:1

Concept Applied

Linked genes do not assort independently, leading to deviation from Mendelian dihybrid ratio....

Read Full Step-by-Step Solution →

Question #11

Practice Question

A.Skin color
B.ABO blood group
C.Hitchhiker's thumb
D.Attached earlobes

Concept Applied

Polygenic inheritance involves multiple genes contributing to a single trait, resulting in continuous variation. Human skin color is controlled by at ...

Read Full Step-by-Step Solution →

Question #12

Practice Question

A.A or B
B.AB only
C.O only
D.A, B, AB, or O

Concept Applied

AB (IᴬIᴮ) × O (ii) → offspring Iᴬi (A), Iᴮi (B)....

Read Full Step-by-Step Solution →

Question #13

Practice Question

A.Heterozygous individuals show a phenotype intermediate between the two homozygotes.
B.Both alleles in a heterozygote are fully expressed, resulting in a phenotype that displays characteristics of both alleles.
C.One allele masks the expression of the other allele in heterozygotes.
D.The phenotype of heterozygotes varies depending on environmental factors.

Concept Applied

In codominance, each allele in a heterozygote contributes equally to the phenotype, so traits of both alleles appear simultaneously (e.g., AB blood ty...

Read Full Step-by-Step Solution →

Question #14

Practice Question

A.Genes are assorting independently
B.The deviation is due to random chance
C.Linkage is likely present
D.Sample size is too small

Concept Applied

If the chi-square value exceeds the critical value at $ p = 0.05 $, we reject the null hypothesis of independent assortment. This indicates that the d...

Read Full Step-by-Step Solution →

Question #15

Practice Question

A.9:3:3:1 ratio
B.Increased parental phenotypes
C.Equal recombinant and parental types
D.Independent assortment

Concept Applied

Linked genes tend to stay together, producing more parental phenotypes than recombinants....

Read Full Step-by-Step Solution →

Question #16

Practice Question

A.X-linked recessive
B.X-linked dominant
C.Autosomal dominant
D.Autosomal recessive

Concept Applied

Fathers pass X chromosome only to daughters....

Read Full Step-by-Step Solution →

Question #17

Practice Question

A.Theoretical foundations
B.Practical applications
C.Experimental data
D.Historical context

Concept Applied

Foundational check for Principles of Inheritance and Variation in Class 12. Study the core principles carefully for competitive exams....

Read Full Step-by-Step Solution →

Question #18

Practice Question

A.A fundamental principle of Biology.
B.A complex derivation in NEET syllabus.
C.An experimental observation.
D.A theoretical assumption.

Concept Applied

This is a placeholder question to ensure comprehensive syllabus coverage. The correct answer highlights the fundamental nature of Principles of Inheri...

Read Full Step-by-Step Solution →

Question #19

Practice Question

A.9:3:3:1
B.3:1
C.1:2:1
D.Deviate from 9:3:3:1

Concept Applied

Linked genes do not assort independently, leading to deviation from Mendelian dihybrid ratio....

Read Full Step-by-Step Solution →

Question #20

Practice Question

A.Skin color
B.ABO blood group
C.Hitchhiker's thumb
D.Attached earlobes

Concept Applied

Polygenic inheritance involves multiple genes contributing to a single trait, resulting in continuous variation. Human skin color is controlled by at ...

Read Full Step-by-Step Solution →

Question #21

Practice Question

A.A or B
B.AB only
C.O only
D.A, B, AB, or O

Concept Applied

AB (IᴬIᴮ) × O (ii) → offspring Iᴬi (A), Iᴮi (B)....

Read Full Step-by-Step Solution →

Question #22

Practice Question

A.Heterozygous individuals show a phenotype intermediate between the two homozygotes.
B.Both alleles in a heterozygote are fully expressed, resulting in a phenotype that displays characteristics of both alleles.
C.One allele masks the expression of the other allele in heterozygotes.
D.The phenotype of heterozygotes varies depending on environmental factors.

Concept Applied

In codominance, each allele in a heterozygote contributes equally to the phenotype, so traits of both alleles appear simultaneously (e.g., AB blood ty...

Read Full Step-by-Step Solution →

Question #23

Practice Question

A.Genes are assorting independently
B.The deviation is due to random chance
C.Linkage is likely present
D.Sample size is too small

Concept Applied

If the chi-square value exceeds the critical value at $ p = 0.05 $, we reject the null hypothesis of independent assortment. This indicates that the d...

Read Full Step-by-Step Solution →

Question #24

Practice Question

A.9:3:3:1 ratio
B.Increased parental phenotypes
C.Equal recombinant and parental types
D.Independent assortment

Concept Applied

Linked genes tend to stay together, producing more parental phenotypes than recombinants....

Read Full Step-by-Step Solution →

Question #25

Practice Question

A.X-linked recessive
B.X-linked dominant
C.Autosomal dominant
D.Autosomal recessive

Concept Applied

Fathers pass X chromosome only to daughters....

Read Full Step-by-Step Solution →

Question #26

Practice Question

A.Theoretical foundations
B.Practical applications
C.Experimental data
D.Historical context

Concept Applied

Foundational check for Principles of Inheritance and Variation in Class 12. Study the core principles carefully for competitive exams....

Read Full Step-by-Step Solution →

Question #27

Practice Question

A.A fundamental principle of Biology.
B.A complex derivation in NEET syllabus.
C.An experimental observation.
D.A theoretical assumption.

Concept Applied

This is a placeholder question to ensure comprehensive syllabus coverage. The correct answer highlights the fundamental nature of Principles of Inheri...

Read Full Step-by-Step Solution →

Question #28

Practice Question

A.9:3:3:1
B.3:1
C.1:2:1
D.Deviate from 9:3:3:1

Concept Applied

Linked genes do not assort independently, leading to deviation from Mendelian dihybrid ratio....

Read Full Step-by-Step Solution →

Question #29

Practice Question

A.Skin color
B.ABO blood group
C.Hitchhiker's thumb
D.Attached earlobes

Concept Applied

Polygenic inheritance involves multiple genes contributing to a single trait, resulting in continuous variation. Human skin color is controlled by at ...

Read Full Step-by-Step Solution →

Question #30

Practice Question

A.A or B
B.AB only
C.O only
D.A, B, AB, or O

Concept Applied

AB (IᴬIᴮ) × O (ii) → offspring Iᴬi (A), Iᴮi (B)....

Read Full Step-by-Step Solution →

Question #31

Practice Question

A.Heterozygous individuals show a phenotype intermediate between the two homozygotes.
B.Both alleles in a heterozygote are fully expressed, resulting in a phenotype that displays characteristics of both alleles.
C.One allele masks the expression of the other allele in heterozygotes.
D.The phenotype of heterozygotes varies depending on environmental factors.

Concept Applied

In codominance, each allele in a heterozygote contributes equally to the phenotype, so traits of both alleles appear simultaneously (e.g., AB blood ty...

Read Full Step-by-Step Solution →

Question #32

Practice Question

A.Genes are assorting independently
B.The deviation is due to random chance
C.Linkage is likely present
D.Sample size is too small

Concept Applied

If the chi-square value exceeds the critical value at $ p = 0.05 $, we reject the null hypothesis of independent assortment. This indicates that the d...

Read Full Step-by-Step Solution →

Question #33

Practice Question

A.9:3:3:1 ratio
B.Increased parental phenotypes
C.Equal recombinant and parental types
D.Independent assortment

Concept Applied

Linked genes tend to stay together, producing more parental phenotypes than recombinants....

Read Full Step-by-Step Solution →

Question #34

Practice Question

A.X-linked recessive
B.X-linked dominant
C.Autosomal dominant
D.Autosomal recessive

Concept Applied

Fathers pass X chromosome only to daughters....

Read Full Step-by-Step Solution →

Question #35

Practice Question

A.Theoretical foundations
B.Practical applications
C.Experimental data
D.Historical context

Concept Applied

Foundational check for Principles of Inheritance and Variation in Class 12. Study the core principles carefully for competitive exams....

Read Full Step-by-Step Solution →

Question #36

Practice Question

A.A fundamental principle of Biology.
B.A complex derivation in NEET syllabus.
C.An experimental observation.
D.A theoretical assumption.

Concept Applied

This is a placeholder question to ensure comprehensive syllabus coverage. The correct answer highlights the fundamental nature of Principles of Inheri...

Read Full Step-by-Step Solution →

Question #37

Practice Question

A.9:3:3:1
B.3:1
C.1:2:1
D.Deviate from 9:3:3:1

Concept Applied

Linked genes do not assort independently, leading to deviation from Mendelian dihybrid ratio....

Read Full Step-by-Step Solution →

Question #38

Practice Question

A.Skin color
B.ABO blood group
C.Hitchhiker's thumb
D.Attached earlobes

Concept Applied

Polygenic inheritance involves multiple genes contributing to a single trait, resulting in continuous variation. Human skin color is controlled by at ...

Read Full Step-by-Step Solution →

Question #39

Practice Question

A.A or B
B.AB only
C.O only
D.A, B, AB, or O

Concept Applied

AB (IᴬIᴮ) × O (ii) → offspring Iᴬi (A), Iᴮi (B)....

Read Full Step-by-Step Solution →

Question #40

Practice Question

A.Heterozygous individuals show a phenotype intermediate between the two homozygotes.
B.Both alleles in a heterozygote are fully expressed, resulting in a phenotype that displays characteristics of both alleles.
C.One allele masks the expression of the other allele in heterozygotes.
D.The phenotype of heterozygotes varies depending on environmental factors.

Concept Applied

In codominance, each allele in a heterozygote contributes equally to the phenotype, so traits of both alleles appear simultaneously (e.g., AB blood ty...

Read Full Step-by-Step Solution →

Question #41

Practice Question

A.Genes are assorting independently
B.The deviation is due to random chance
C.Linkage is likely present
D.Sample size is too small

Concept Applied

If the chi-square value exceeds the critical value at $ p = 0.05 $, we reject the null hypothesis of independent assortment. This indicates that the d...

Read Full Step-by-Step Solution →

Question #42

Practice Question

A.9:3:3:1 ratio
B.Increased parental phenotypes
C.Equal recombinant and parental types
D.Independent assortment

Concept Applied

Linked genes tend to stay together, producing more parental phenotypes than recombinants....

Read Full Step-by-Step Solution →

Question #43

Practice Question

A.X-linked recessive
B.X-linked dominant
C.Autosomal dominant
D.Autosomal recessive

Concept Applied

Fathers pass X chromosome only to daughters....

Read Full Step-by-Step Solution →

Question #44

Practice Question

A.Theoretical foundations
B.Practical applications
C.Experimental data
D.Historical context

Concept Applied

Foundational check for Principles of Inheritance and Variation in Class 12. Study the core principles carefully for competitive exams....

Read Full Step-by-Step Solution →

Question #45

Practice Question

A.A fundamental principle of Biology.
B.A complex derivation in NEET syllabus.
C.An experimental observation.
D.A theoretical assumption.

Concept Applied

This is a placeholder question to ensure comprehensive syllabus coverage. The correct answer highlights the fundamental nature of Principles of Inheri...

Read Full Step-by-Step Solution →

Question #46

Practice Question

A.9:3:3:1
B.3:1
C.1:2:1
D.Deviate from 9:3:3:1

Concept Applied

Linked genes do not assort independently, leading to deviation from Mendelian dihybrid ratio....

Read Full Step-by-Step Solution →

Question #47

Practice Question

A.Skin color
B.ABO blood group
C.Hitchhiker's thumb
D.Attached earlobes

Concept Applied

Polygenic inheritance involves multiple genes contributing to a single trait, resulting in continuous variation. Human skin color is controlled by at ...

Read Full Step-by-Step Solution →

Question #48

Practice Question

A.A or B
B.AB only
C.O only
D.A, B, AB, or O

Concept Applied

AB (IᴬIᴮ) × O (ii) → offspring Iᴬi (A), Iᴮi (B)....

Read Full Step-by-Step Solution →

Question #49

Practice Question

A.Heterozygous individuals show a phenotype intermediate between the two homozygotes.
B.Both alleles in a heterozygote are fully expressed, resulting in a phenotype that displays characteristics of both alleles.
C.One allele masks the expression of the other allele in heterozygotes.
D.The phenotype of heterozygotes varies depending on environmental factors.

Concept Applied

In codominance, each allele in a heterozygote contributes equally to the phenotype, so traits of both alleles appear simultaneously (e.g., AB blood ty...

Read Full Step-by-Step Solution →

Question #50

Practice Question

A.Genes are assorting independently
B.The deviation is due to random chance
C.Linkage is likely present
D.Sample size is too small

Concept Applied

If the chi-square value exceeds the critical value at $ p = 0.05 $, we reject the null hypothesis of independent assortment. This indicates that the d...

Read Full Step-by-Step Solution →
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