Principles of Inheritance and Variation Biology NEET Quiz Online

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Details of Principles of Inheritance and Variation Biology NEET Quiz Online
No. of Questions in Quiz34 with Explanation
Time for each Questions60 Seconds
Attempts AllowedUnlimited
Pass Percentage70 %

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#1. A woman has an X-linked condition on one of her X chromosomes. This chromosome can be inherited by

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

#3. Select the correct statement

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 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.

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?

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?

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

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

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

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

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?

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

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?

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

#15. The term "Linkage" was coined by

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

#16. A pleiotropic gene

The gene which controls multiple traits in an individual.

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

Mendel did not selected Pod length as a character for study

#18. A gene showing codominance has

Both alleles are independently expressed in heterozygote during codominance.

#19. Alleles are

Alleles are slightly different molecular forms of the same gene.

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

Translocation is illegitimate crossing over between non-homologous chromosome.

#21. Multiple alleles are present

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

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?

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

#24. Fruit colour in squash is an example of

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 ?

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

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

#28. The incorrect statement with regard to Haemophilia is

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

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

#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

#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?

#33. A test cross is carried out to

Cross with recessive parent.




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