Principles Of Inheritance And Variation — DPP 20

20 NEET questions from Principles Of Inheritance And Variation, with answers and explanations. Attempt it as a timed test to get scoring, accuracy breakdown and mistake tracking.

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1
Genotype of plant is $\frac { + + } { \mathrm { ab } }$ and there is $18 \%$ recombination present in it then percentage of gametes will be :-
  1. A $+ + = 9 \%$
  2. B $\mathrm { ab } = 18 \%$
  3. C $+ \mathrm { b } = 9 \%$
  4. D $\mathrm { a } + = 41 \%$
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Correct answer: C

2
What is the frequency of pure round seeded pea plants in $\mathrm{F _ { 2 }}$ generation of a dihybrid cross
  1. A $4 / 16$
  2. B $6 / 16$
  3. C $1 / 16$
  4. D $2 / 16$
Show answer

Correct answer: A

3
What is correct about true-breeding pea line?
  1. A A true breeding line is one that, having undergone continuous self-pollination, shows the stable trait inheritance and expression for several generations.
  2. B Mendel selected 14 true breeding pea plant varieties, as pairs which were similar except for one character with contrasting traits
  3. C Mendel selected 7 true-breeding pea plant varieties, as pairs which were similar except for one character with contrasting traits
  4. D Both (A) and (B)
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Correct answer: D

4
Physical association of two genes is known as:
  1. A Recombination
  2. B Linkage
  3. C Crossing over
  4. D Sex determination
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Correct answer: B

5
In a linear chromosome, map distance between four loci are $\mathrm { ab } = 12 , \mathrm { bc } = 4 , \mathrm { ad } = 2 , \mathrm { ac } = 8$. The distance between c and d will be -
  1. A $10 \%$
  2. B $6 \%$
  3. C $10 \%$ or $6 \%$
  4. D $3 \%$ or $6 \%$
Show answer

Correct answer: C

6
Identify the set of incorrect statement/s :
(a) Gene which code for a pair of contrasting traits are known as Allele.
(b) Mendelian factors are discrete units.
(c) A large sample size is required to make any quantitative conclusion.
(d) Graphical representation to calculate the probability of all possible genotype of offsprings genetic cross, developed by Morgan.
Choose the correct answer from the option given below :
  1. A (a) and (c) only
  2. B (d) only
  3. C (a), (b) and (d) only
  4. D (b) and (d) only BPV68
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Correct answer: B

7
Which one of the following conditions though harmful in itself, is also a potential saviour from a mosquito borne infectious disease :-
  1. A Thalassaemia
  2. B Sickle cell anaemia
  3. C Pernicious anaemia
  4. D Leukaemia
Show answer

Correct answer: B

8
In which of the following the inheritance takes place only by male :-
  1. A Nuclear
  2. B Cytoplasmic
  3. C Co-dominance
  4. D Holandric inheritance
Show answer

Correct answer: D

9
Given below are two statements:
Statement-I : Mendel's study found that the factors independently assort and combine in all permutations and combinations.
Statement-II : Later, it was found that Mendel's law of independent assortment does not hold true for the genes located on the same chromosomes.
In the light of the above statements, choose the most appropriate answer from the options given below:
  1. A Both Statement-I and Statement-II are incorrect.
  2. B Statement-I is correct but statement-II is incorrect.
  3. C Statement-I is incorrect but Statement-II is correct.
  4. D Both Statement-I and Statement-II are correct.
Show answer

Correct answer: D

10
Select the correct statement from the ones gives below with respect to dihybrid cross :
  1. A Genes loosely linked on the same chromosome show similar recombination as the tightly linked ones.
  2. B Tightly linked genes on the same chromosome show very few recombination's.
  3. C Tightly linked genes on the same chromosome show higher recombination.
  4. D Genes far apart on the same chromosome show very few recombination's.
Show answer

Correct answer: B

11
By the cross of F1 linked dihybrid plant with a plant of genotype aabb, we get the 1300 plants out of 2000 of parental type. The distance between A and B gene is :-
  1. A 35 map unit
  2. B 15 map unit
  3. C 65 map unit
  4. D 85 map unit
Show answer

Correct answer: A

12
Given below are two statements:
Statement-I : ABO blood group system provide a good example of multiple alleles.
Statement-II : Multiple Allele can be found in an individual of Human population.
In the light of the above statements, choose the most appropriate answer from the options given below:
  1. A Both Statement-I and II are incorrect.
  2. B Statement-I is correct but statement-II is incorrect.
  3. C Statement-I is incorrect but Statement-II is correct.
  4. D Both Statement-I and II are correct.
Show answer

Correct answer: B

13
'Mendel work remain unrecognised till 1900'. Which statement is not correct regarding above statement:-
  1. A Communication was not easy
  2. B Mendel did not provide any physical proof of factor
  3. C Factors which did not blend with each other, was not accepted by his contemporaries
  4. D Mendel's approach of using mathematics was totally new and unacceptable
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Correct answer: B

14
Which symbol used for unspecified sex :-
  1. A □ $
  2. B \bigcirc$
  3. C
  4. D BPV648
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Correct answer: C

15
A person having genotype $\mathrm { I } ^ { \mathrm { A } }$ and $\mathrm { I } ^ { \mathrm { B } }$ will show AB blood group. This is because of-
  1. A Segregation
  2. B Dominance
  3. C Co-dominance
  4. D Independent assortment
Show answer

Correct answer: C

16
An offspring of two homozygous parents differing from one another by alleles at only one gene locus is known as :-
  1. A Back cross
  2. B Monohybrid
  3. C Dihybrid
  4. D Trihybrid
Show answer

Correct answer: B

17
Find out the number of heterozygous free ear lobed persons in a population of 3000 if the proportion of fused ear lobed persons is 9%:
  1. A 1260
  2. B 1470
  3. C 270
  4. D 2730
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Correct answer: A

18
In Mirabilis jalapa, the percentage of plants having pink and red flowers would be $\_\_\_\_$ when pink flower plant is test crossed.
  1. A $25 \%$ pink & $25 \%$ red
  2. B $50 \%$ pink & $50 \%$ red
  3. C $50 \%$ pink & $0 \%$ red
  4. D 0\% pink & 50\% red
Show answer

Correct answer: C

19
Identify $\mathrm { A } , \mathrm { B }$ and C in the given representative figure showing an individual inflicted with down syndrome.
Principles Of Inheritance And Variation – NEET-5179 Principles Of Inheritance And Variation – NEET-5179

  1. A & \begin{tabular} { l } Flat back \\ of head \end{tabular} & \begin{tabular} { l } Broad \\ flat face \end{tabular} & \begin{tabular} { l } Small and \\ wrinkled tongue \end{tabular} \\
  2. B & \begin{tabular} { l } Flat back \\ of head \end{tabular} & \begin{tabular} { l } Broad \\ flat face \end{tabular} & \begin{tabular} { l } Big and wrinkled \\ tongue \end{tabular} \\ \hline
  3. C & \begin{tabular} { l } Oval back \\ head \end{tabular} & \begin{tabular} { l } Broad \\ flat face \end{tabular} & \begin{tabular} { l } Big and wrinkled \\ tongue \end{tabular} \\ \hline
  4. D & \begin{tabular} { l } Oval back \\ head \end{tabular} & flat face & Wrinkled tongue \\ \hline \end{tabular} BPV707
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Correct answer: C

20
Select the correct statement regarding dihybrid cross-
  1. A Genes of the same chromosomes that are loosely linked, show similar recombination as the tightly linked genes do.
  2. B Tightly linked genes like body colour and eye colour genes in Drosophila show very less recombination.
  3. C Tightly linked genes of the same chromosomes show high recombination.
  4. D Genes that are far apart and present on the same chromosomes show very little recombination.
Show answer

Correct answer: B

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