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NEET Exam  >  NEET Tests  >  Biology Class 12  >  Assertion & Reason Test: Principles of Inheritance & Variation - 2 - NEET MCQ

Assertion & Reason Test: Principles of Inheritance & Variation - 2 - NEET MCQ


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15 Questions MCQ Test Biology Class 12 - Assertion & Reason Test: Principles of Inheritance & Variation - 2

Assertion & Reason Test: Principles of Inheritance & Variation - 2 for NEET 2024 is part of Biology Class 12 preparation. The Assertion & Reason Test: Principles of Inheritance & Variation - 2 questions and answers have been prepared according to the NEET exam syllabus.The Assertion & Reason Test: Principles of Inheritance & Variation - 2 MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Assertion & Reason Test: Principles of Inheritance & Variation - 2 below.
Solutions of Assertion & Reason Test: Principles of Inheritance & Variation - 2 questions in English are available as part of our Biology Class 12 for NEET & Assertion & Reason Test: Principles of Inheritance & Variation - 2 solutions in Hindi for Biology Class 12 course. Download more important topics, notes, lectures and mock test series for NEET Exam by signing up for free. Attempt Assertion & Reason Test: Principles of Inheritance & Variation - 2 | 15 questions in 30 minutes | Mock test for NEET preparation | Free important questions MCQ to study Biology Class 12 for NEET Exam | Download free PDF with solutions
Assertion & Reason Test: Principles of Inheritance & Variation - 2 - Question 1
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Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

Assertion (A) : ABO blood group in human being is an example of multiple allelism.

Reason (R) : It has three alleles for the gene 1 i.e. IA, IB, i.

Detailed Solution for Assertion & Reason Test: Principles of Inheritance & Variation - 2 - Question 1
Due to three different types of allele IA, IB, i in blood group, it shows multiple allelism.
Assertion & Reason Test: Principles of Inheritance & Variation - 2 - Question 2
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Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

Assertion : Test cross is a back cross.

Reason : In test cross, individual is crossed with recessive parent.

Detailed Solution for Assertion & Reason Test: Principles of Inheritance & Variation - 2 - Question 2
Backcross is cro ss which is p e rfo rm ed between hybrid and one of its parents. In test cross, the individual is crossed with recessive parent. It is called a test cross, because it is used to test whether an individual is homozygous or heterozygous (hybrid).
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Assertion & Reason Test: Principles of Inheritance & Variation - 2 - Question 3
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Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

Assertion (A) : Cross of F1 individual with recessive homozygous parent is test cross.

Reason (R) : No recessive individual are obtained in the monohybrid test cross progeny.

Detailed Solution for Assertion & Reason Test: Principles of Inheritance & Variation - 2 - Question 3
In the monohybrid test cross progeny both heterozygous and recessive individuals are obtained in 1 : 1 ratio.
Assertion & Reason Test: Principles of Inheritance & Variation - 2 - Question 4
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Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

Assertion : Complementary genes are non-allelic genes.

Reason : Complementary genes interact to produce a completely new trait.
Detailed Solution for Assertion & Reason Test: Principles of Inheritance & Variation - 2 - Question 4
Complementary genes are those non-allelic genes which independently show a similar effect but produces a new trait when present together in the dominant form. W. Bateson and R.C. Punnett observed that, when two white flowered varieties of sweet pea, Lathyrus odoratus were crossed, F1 progeny had coloured flowers. When F2 progeny obtained from F1 was classified, plants with coloured flowers and those with white flowers were obtained in 9 : 7 ratio. The two dominants are brought together in F1 generation and therefore coloured flowers are produced.
Assertion & Reason Test: Principles of Inheritance & Variation - 2 - Question 5
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Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

Assertion: Gametes receives only one allele of a gene.

Reason: During gamete formation, mitosis takes place leads to formation of haploid cells.
Detailed Solution for Assertion & Reason Test: Principles of Inheritance & Variation - 2 - Question 5
Meiosis is the process by which gametes are formed and during this process only one variant of gene pass to the gamete.
Assertion & Reason Test: Principles of Inheritance & Variation - 2 - Question 6
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Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

Assertion : A gene may have several allelomorphs.

Reason: Wild form can mutate in more than one ways.
Detailed Solution for Assertion & Reason Test: Principles of Inheritance & Variation - 2 - Question 6
According to Mendel's concept of inheritance, each gene had two alternative forms or allelomorphs, one being dominant and the other recessive. Practically, the wild form can mutate in several ways. The mutant form can also mutate once again to give rise to another mutant form. Therefore, a gene can have more than two allelomorphs. These allelomorphs make a series of multiple alleles.
Assertion & Reason Test: Principles of Inheritance & Variation - 2 - Question 7
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Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

Assertion : A pair of contrasting characters is termed as allele.

Reason : Only one gene of an allele is expressed in an individual.
Detailed Solution for Assertion & Reason Test: Principles of Inheritance & Variation - 2 - Question 7
An allele is an alternative form of a gene one member of a pair that is located at a specific position on a specific chromosome. Diploid organisms, for example, humans, have paired homologous chromosomes in their somatic cells, and these contain two copies of each gene.
Assertion & Reason Test: Principles of Inheritance & Variation - 2 - Question 8
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Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

Assertion: Pure lines are called true breed.

Reason : True breeds are used for cross breeding.
Detailed Solution for Assertion & Reason Test: Principles of Inheritance & Variation - 2 - Question 8
Pure line is a strain of genetically pure true breeding individuals. Members of pure line are homozygous for one or more characters. In homozygous form both the factors express the same effect. These organisms are said to breed true. They are used for cross breeding in order to get the desired improvement in crops.
Assertion & Reason Test: Principles of Inheritance & Variation - 2 - Question 9
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Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

Assertion: The cross between the F1 progeny and either of the parent types is a test cross.

Reason: The cross between F1 progeny and the double recessive genotype is back cross.
Detailed Solution for Assertion & Reason Test: Principles of Inheritance & Variation - 2 - Question 9

Correct option is D

Both Assertion and Reason are incorrect

A test cross is a cross involves the breeding of an individual with a phenotypically recessive individual, in order to determine the zygosity of the former by analyzing proportions of offspring phenotype and not the parent types. Back cross is the crossing of a hybrid with one of its parents or an individual genetically similar to its parent, in order to achieve offspring with a genetic identity which is closer to that of the parent. 

So, the correct answer is 'Both Assertion and Reason are incorrect'.

Assertion & Reason Test: Principles of Inheritance & Variation - 2 - Question 10
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Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

Assertion : Mendel was successful in his hybridization.

Reason : Garden pea proved ideal experimental material.
Detailed Solution for Assertion & Reason Test: Principles of Inheritance & Variation - 2 - Question 10
Mendel chose garden pea as plant material for his experiments, since it had the following advantages

(i) Well defined characters.

(ii) Bisexual flowers.

(iii) Predominantly self-fertilization.

(iv) Easy hybridization.

Besides these features, garden pea, being self-fertilized, had pure lines due to natural self-fertilization for a number of years. Therefore, any variety used was pure for the characters it carried. Mendel’s success was mainly based on the fact that he considered a single character at one time.

Assertion & Reason Test: Principles of Inheritance & Variation - 2 - Question 11
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Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

Assertion: In monohybrid cross, at F2 stage, both parental traits are expressed in 3 : 1 proportion.

Reason: At F2 stage, the contrasting parental traits show blending.
Detailed Solution for Assertion & Reason Test: Principles of Inheritance & Variation - 2 - Question 11
Both the parental traits of a character in F2 generation are expressed in the ratio of three dominant to one recessive. Whereas, in F1 generation only one of the parental traits is expressed and the other lies hidden or unexpressed. However, in the hybrid there is no mixing of two characters. At the time formation of gamete, two factors separate or segregate and passes into different gametes, that hence have one factor of a pair. During fertilization, gametes fuse randomly so that factors come together in new generation and freely express themselves.
Assertion & Reason Test: Principles of Inheritance & Variation - 2 - Question 12
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Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

Assertion: Mendel used true-breeding pea lines for artificial pollination experiments for his genetic studies.

Reason: For several generations, a true-breeding line shows the stable trait inheritance and expression.
Detailed Solution for Assertion & Reason Test: Principles of Inheritance & Variation - 2 - Question 12
On garden pea for many years mendel carried out hybridization experiments. He performed various types of cross breeding and then allowed the offspring for self breeding. He selected varieties and used pure lines of true breeding lines, i.e., they produce offspring resembling the parents. these lines show the stable trait inheritance and expression for several generations making them suitable for genetic studies.
Assertion & Reason Test: Principles of Inheritance & Variation - 2 - Question 13
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Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

Assertion : In a monohybrid cross, F1 generation indicate dominant characters.

Reason : Dominance occurs only in heterozygous state.
Detailed Solution for Assertion & Reason Test: Principles of Inheritance & Variation - 2 - Question 13
Monohybrid cross is a cross between two organisms of a species which is made to study the inheritance of a single pair of alleles or factors of a character. Dominant character is one of a pair of alleles which can express itself whether present in homozygous or heterozygous state. In F1, generation, the generation of hybrids produced from a cross between the genetically different homozygous individuals called parents the progenies are heterozygous dominant.
Assertion & Reason Test: Principles of Inheritance & Variation - 2 - Question 14
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Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

Assertion: On true breeding lines, Mendel conducted cross pollination experiments.

Reason: For several generations, true breed line have stable trait inheritance.
Detailed Solution for Assertion & Reason Test: Principles of Inheritance & Variation - 2 - Question 14
True breeding lines have inheritance of pure characters for several generations.
Assertion & Reason Test: Principles of Inheritance & Variation - 2 - Question 15
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Direction: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

Assertion: Genes pass from one generation to another.

Reason: The unit of inheritance are genes.
Detailed Solution for Assertion & Reason Test: Principles of Inheritance & Variation - 2 - Question 15
Chromosomes carry gene that passes on the traits of parents to the offsprings during genetic recombination.
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