Principle of Inheritance and Variation MCQ. We covered all the Principle of Inheritance and Variation MCQ in this post for free so that you can practice well for the exam.
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MCQ on Principle of Inheritance and Variation for NEET Students
If two pea plants having homozygous yellow-colored seeds and green-colored seeds are crossed. What will be the outcome?
(A) All hybrids will have green-colored seeds.
(B) All hybrids will have yellow-coloured seeds.
(C) All hybrids will be homozygous.
(D) All hybrids will be homozygous for the yellow color of seeds.
Option b – All hybrids will have yellow-coloured seeds.
The recombination percent obtained when white-eyed, yellow-bodied Drosophila crossed with its wild type was
(A) 37.2%
(B) 98.7%
(C) 1.3%
(D) 62.8%
Option c – 1.3%
Identify the INCORRECT match.
(A) Down’s syndrome – 45 + XX or 45+ XY
(B) Klinefelter’s syndrome – 44+ XYY
(C) Turner’s syndrome – 44 + XO
(D) Normal human male – 44 + XY
Option b – Klinefelter’s syndrome – 44+ XYY
The genotype of the female is represented as
(A) XO
(B) XX
(C) ZW
(D) ZZ
Option c – ZW
Co-dominant alleles are
(A) alleles loosely linked on the same chromosome.
(B) alleles that are able to express themselves independently even if present together.
(C) the alleles dominant on other alleles.
(D) alleles tightly linked on the same chromosome.
Option b – alleles that are able to express themselves independently even if present together.
The cross between TT and it produces a hybrid “Tt’. If this F₁ progeny is inbred, how many types of F₂ genotypes will be obtained?
(A) 3
(B) 2
(C) 4
(D) 1
Option a – 3
Select the INCORRECT statement among the following.
(A) Mutation results in the alteration of DNA sequences.
(B) Chromosomal aberrations are observed in cancer cells.
(C) UV radiation is an example of chemical mutagens.
(D) Point mutation arises due to a change in a single base pair of DNA.
Option c – UV radiation is an example of chemical mutagens
The phenotype of an F₂ generation of a dihybrid cross between pea plants (YYRR) and (yyrr) can be correctly written as
(A) 9 Wrinkled Yellow, 3 Round Green. 3 Yellow Round, 1 Wrinkled Green
(B) 9 Round Yellow, 3 Wrinkled Yellow. 3 Round Green, 1 Wrinkled Green
(C) 9 Wrinkled Green, 3 Yellow Round. 3 Wrinkled Yellow, 1 Round Green
(D) 9 Round Green, 3 Wrinkled Green, 3 Round Yellow, 1 Wrinkled Yellow
Option b – 9 Round Yellow, 3 Wrinkled Yellow. 3 Round Green, 1 Wrinkled Green
On selfing the F₁ hybrid ‘YyRr’, the ratio of individuals showing one dominant and the other recessive character will be
(A) 1/16
(B) 6/16
(C) 8/16
(D) 9/16
Option b – 6/16
Identify the INCORRECT statement with respect to experiments performed by Morgan and his group regarding gene linkage and recombination.
(A) Morgan coined the term linkage to describe the physical association of genes on a chromosome.
(B) It was found that genes that are grouped on the same chromosome are loosely linked and show high recombination.
(C) Morgan studied sex-linked genes by carrying out several dihybrid crosses in Drosophila.
(D) Morgan hybridized yellow-bodied white-eyed females with brown – bodied, red-eyed males, and observed that F₂ ratio deviated significantly from the 9 : 3 : 3 : 1.
Option b – It was found that genes that are grouped on the same chromosome are loosely linked and show high recombination.
Assertion: Mendel’s work did not gain recognition. Reason: The concept of genes as stable and discrete units controlling the expression of traits was not accepted.
(A) Both assertion and reason are true and the reason is the correct explanation of assertion.
(B) Both assertion and reason are true and the reason is not the correct explanation of assertion.
(C) The assertion is true and the reason is false.
(D) Both assertion and reason are false.
Option a – Both assertion and reason are true and the reason is the correct explanation of assertion.
Which of the following genotype produces larger starch grains in pea plants?
(A) BB
(B) Bb
(C) bb
(D) all of these
Option a – BB
Identify the CORRECT statement regarding Punnett square.
(A) It was developed by a British geneticist, Reginald C. Punnett.
(B) The production of gametes by the parents, the formation of the zygotes, and the F₁ and F₂ plants can be understood from a diagram called Punnett square.
(C) It is a graphical representation to calculate the probability of all possible genotypes of offspring in a genetic cross.
(D) all of these
Option d – all of these
…….. contrasting characters of pea plants were studied by Gregor Mendel.
(A) 4
(B) 7
(C) 10
(D) 12
Option b – 7
Which of the following cross of pea plants would yield 50% violet flowers and 50% white flowers?
(A) Violet homozygous x Violet heterozygous
(B) White homozygous x White homozygous
(C) Violet heterozygous x White homozygous
(D) Violet homozygous x White heterozygous
Option c – Violet heterozygous x White homozygous
If a cross is made between pure tall pea plant and pure dwarf pea plant, what would be the possible phenotypes in F₂ generation :
(A) 1 Tall : 2 Dwarf
(B) 3 Tall : 1 Dwarf
(C) 1 Tall : 2 hybrid tall : 1 : dwarf
(D) 3 Dwarf : 1 Tall
Option b – 3 Tall : 1 Dwarf
Which of the following represents the test cross?
(A) Ww x WW
(B) WW x WW
(C) Ww x ww
(D) WW x Ww
Option c – Ww x ww
Inheritance of skin color in humans is an example of
(A) pleiotropy
(B) codominance
(C) polygenic inheritance
(D) multiple alleles
Option c – polygenic inheritance
If a mother heterozygous for the B blood group and the father is heterozygous for the A blood group, then the blood group of the child can be
(A) A, AB or O but never B
(B) AB but never O
(C) A, B or O but never AB
(D) A, B, AB or O
Option d – A, B, AB or O
In a pea plant, the trait round shape of seeds is dominant over the wrinkled shape of seeds. On selfing the pea plant heterozygous for the round shape of seeds, 1800 seeds were produced during the cross. How many seedlings will have parental phenotype?
(A) 1000
(B) 1150
(C) 1350
(D) 2250
Option c – 1350
In the XO type of sex determination system
(A) all-female gametes bear an additional pair of X chromosomes along with autosomes.
(B) some of the male gametes bear the X chromosome whereas some do not.
(C) the egg fertilized by sperm having an X chromosome develops into a female and that does not have an X chromosome develops into a male.
(D) all of these
Option d – all of these
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