Principles of Inheritance and Variation Biology NEET Quiz Online

No. of Questions in Quiz	34 with Explanation
Time for each Questions	60 Seconds
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#1. A woman has an X-linked condition on one of her X chromosomes. This chromosome can be inherited by

Only daughters

Only sons

Both sons and daughters

Only grandchildren

Woman is a carrier

Both son & daughter inherit X–chromosome
Although only son be the diseased

#2. Which of the following pairs is wrongly matched?

Starch synthesis in pea: Multiple alleles

ABO blood grouping: Co-dominance

T.H. Morgan: Linkage

XO type sex determin: Grasshopperation

Starch synthesis in pea is controlled by pleiotropic gene. Other options (2, 3 & 4) are correctly matched.

#3. Select the correct statement

Franklin Stahl coined the term ‘‘linkage’’

Punnett square was developed by a British scientist

Transduction was discovered by S. Altman

Spliceosomes take part in translation

Punnett square was developed by a British geneticist, Reginald C. Punnett. – Franklin Stahl proved semi-conservative mode of replication. – Transduction was discovered by Zinder and Laderberg. – Spliceosome formation is part of post-transcriptional change in eukaryotes

#4. A disease caused by an autosomal primary non-disjunction is

Down's syndrome

Klinefelter's syndrome

Turner's syndrome

Sickle cell anemia

Down’s syndrome is caused by non-disjunction of 21st chromosome.

#5. Thalassemia and sickle cell anemia are caused due to a problem in globin molecule synthesis. Select the correct statement.

Both are due to a qualitative defect in globin chain synthesis

Both are due to a quantitative defect in globin chain synthesis

Thalassemia is due to less synthesis of globin molecules

Sickle cell anemia is due to a quantitative problem of globin molecules

Thalassemia differs from sickle-cell anaemia in that the former is a quantitative problem of synthesising too few globin molecules while the latter is a qualitative problem of synthesising an incorrectly functioning globin.

#6. Which one from those given below is the period for Mendel's hybridization experiments?

1856 - 1863

1840 - 1850

1857 - 1869

1870 - 1877

Mendel conducted hybridization experiments on Pea plant for 7 years between 1856 to 1863 and his data was published in 1865.

#7. Among the following characters, which one was not considered by Mendel in his experiments on pea?

Stem – Tall or Dwarf

Trichomes – Glandular or non-glandular

Seed – Green or Yellow

Pod – Inflated or Constricted

During his experiments Mendel studied seven characters. Nature of trichomes i.e., glandular or non-glandular was not considered by Mendel.

#8. The mechanism that causes a gene to move from one linkage group to another is called

Inversion

Duplication

Translocation

Crossing-over

Translocation is a phenomenon of transfer of a gene segment between non-homologus chromosome, i.e., different linkage group.

#9. A true breeding plant is

One that is able to breed on its own

Produced due to cross-pollination among unrelated plants

Near homozygous and produces offspring of its own kind

Always homozygous recessive in its genetic constitution

True breeding line is one that, having undergone continuous self pollination, shows the stable trait inheritance and expression for several generations. It is both homozygous recessive as well as dominant in genetic constitution.

#10. If a colour-blind man marries a woman who is homozygous for normal colour vision, the probability of their son being colour-blind is

0.5

0.75

Colourblindness is X-linked recessive disease and shows criss-cross inheritance.

#11. In a testcross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant-type offspring.This indicates

Both of the characters are controlled by more than one gene

The two genes are located on two different chromosomes

Chromosomes failed to separate during meiosis

The two genes are linked and present on the same chromosome

When two genes in a dihybrid cross are situated on the same chromosome, the proportion of parental gene combinations are much higher than the non-parental or recombinant type.

#12. Which of the following most appropriately describes haemophilia?

Dominant gene disorder

Recessive gene disorder

X-linked recessive gene disorder

Chromosomal disorder

Haemophilia is X-linked recessive gene disorder. It is a blood clotting disorder and shows criss-cross inheritance.

#13. A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the F1 plants were selfed the resulting genotypes were in the ratio of

3 : 1 : : Dwarf : Tall

1 : 2 : 1 : : Tall homozygous : Tall heterozygous : Dwarf

1 : 2 : 1 : : Tall heterozygous : Tall homozygous : Dwarf

3 : 1 : : Tall : Dwarf

Phenotypic ratio = 3 : 1 [Tall : Dwarf]

Genotypic ratio

1 : 2 : 1 [Homozygous tall : Heterozygous tall : Dwarf]

#14. Which of the following phenomena leads to variation in DNA?

Linkage, mutation

Recombination, linkage

Mutation, recombination

Aneuploidy, linkage

Mutation → Sudden change in genetic Material
Recombination → Non-parental combination

#15. The term "Linkage" was coined by

W. Sutton

T.H. Morgan

T. Boveri

G. Mendel

The term “linkage” was coined by T.H. Morgan.

#16. A pleiotropic gene

Controls multiple traits in an individual

Is expressed only in primitive plants

Is gene evolved during Pliocene

Controls a trait only in combination with another gene

The gene which controls multiple traits in an individual.

#17. In his classic experiments on pea plants, Mendel did not use

Flower position

Seed colour

Pod length

Seed shape

Mendel did not selected Pod length as a character for study

#18. A gene showing codominance has

Both alleles independently expressed in the heterozygote.

One allele dominant on the other

Alleles tightly linked on the same chromosome

Alleles that are recessive to each other

Both alleles are independently expressed in heterozygote during codominance.

#19. Alleles are

Heterozygotes

Different phenotype

True breeding homozygotes

Different molecular forms of a gene

Alleles are slightly different molecular forms of the same gene.

#20. The movement of a gene from one linkage group to another is called

Crossing over

Inversion

Duplication

Translocation

Translocation is illegitimate crossing over between non-homologous chromosome.

#21. Multiple alleles are present

On non-sister chromatids

On different chromosomes

At different loci on the same chromosome

At the same locus of the chromosome

All alleles of a gene are located on the same loci of chromosome in population.

#22. An abnormal human baby with 'XXX' sex chromosomes was born due to

Fusion of two sperm and one ovum

Formation of abnormal sperms in the father

Formation of abnormal ova in the mother

Fusion of two ova and one sperm

Due to non-disjunction of X-chromosomes in mother A XX (egg) × A X (sperm)

#23. How many pairs of contrasting characters in pea plants were studied by Mendel in his experiments?

Seven

Five

Six

Eight

7 pairs of contrasting characters in pea plant were studied by Mendel in his experiment.

#24. Fruit colour in squash is an example of

Recessive epistasis

Dominant epistasis

Complementary genes

Inhibitory genes

Dominant epistasis is the phenomenon of masking or supressing the expression of a gene by a dominant nonallelic gene.

e.g., fruit colour in Cucurbita pepo (Summer squash)

#25. A man whose father was colour blind marries a woman who had a colour blind mother and normal father. What percentage of male children of this couple will be colour blind ?

25%

50%

75%

#26. A human female with Turner's syndrome:

Has 45 chromosomes with XO

Has one additional X chromosome

Exhibits male characters

Is able to produce children with normal husband

Turner’s syndrome is caused due to the absence of one of the X chromosomes i.e., 45 (44 XO).

#27. If both parents are carriers for thalessemia, which is an autosomal recessive disorder, what are the chances

50%

25%

100%

No chance

#28. The incorrect statement with regard to Haemophilia is

It is a recessive disease

It is a dominant disease

A single protein involved in the clotting of blood is affected

It is a sex-linked disease

#29. Which Mendelian idea is depicted by a cross in which the F1 generation resembles both the parents?

Law of dominance

Inheritance of one gene

Co-dominance

Incomplete dominance

#30. Which of the following statements is not true of two genes that show 50% recombination fequency ?

The genes are tightly linked

The genes show independent assortment

If the genes are present on the same chromosome, they undergo more than one crossovers in every meiosis

The genes may be on different chromosomes

#31. F2 generation in a Mendelian cross showed that both genotypic and phenotypic ratios are same as 1 : 2 : 1.It represents a case of

Monohybrid cross with complete dominance

Monohybrid cross with incomplete dominance

Co-dominance

Dihybrid cross

#32. A normal-visioned man whose father was colour-blind, marries a woman whose father was also colour blind. They have their first child as a daughter. What are the chances that this child would be colour-blind?

25%

50%

100%

Zero percent

#33. A test cross is carried out to

Determine the genotype of a plant at F2

Predict whether two traits are linked

Asses the number of alleles of a gene

Determine whether two species or varieties will breed successfully

Cross with recessive parent.

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