Principles Of Inheritance And Variation — DPP 18

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
Assertion (A) : Law of segregation is based on the fact that the alleles do not show any blending.
Reason (R) : Factor or alleles of a pair segregate from each other such that a gamete receives only one of the two factor.
In the light of the above statements, choose the correct answer from the options given below :
  1. A Both (A) & (R) are correct but (R) is not the correct explanation of (A).
  2. B (A) is correct but (R) is not correct.
  3. C (A) is not correct but (R) is correct.
  4. D Both (A) & (R) are correct and (R) is the correct explanation of (A).
Show answer

Correct answer: D

2
Which of the following characters of Drosophila is not suitable for genetical studies
(a) They could be grown on simple synthetic medium in laboratory
(b) They complete their life cycle in about 2-weeks
(c) Single mating produces few number of progeny flies.
(d) They have many types of hereditary variations that can be seen with low power microscope.
(e) Male & Female flies are not easily distinguishable
  1. A a, b, c
  2. B a, b, c, d, e
  3. C d and e
  4. D c and e
Show answer

Correct answer: D

3
Total number of genotypes and phenotypes in a dihybrid test cross is -
  1. A 9
  2. B 8
  3. C 16
  4. D 13
Show answer

Correct answer: B

4
Linkage was discovered in Drosophila by :-
  1. A Bateson
  2. B Morgan
  3. C Muller
  4. D Correns
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Correct answer: B

5
Identify the set of correct statement/s.
(a) Grasshopper is an example of female heterogamety.
(b) In birds, total number of chromosome is same in both male and female.
(c) In honey bee, fertilized egg develops queen and unfertilized egg develops worker.
(d) Haplo-diploid sex-determination system found in Honey bee.
Choose the correct answer from the option given below :
  1. A (a) and (d) only
  2. B (b), (c) and (d) only
  3. C (a), (b), (c) and (d)
  4. D (a), (b) and (c) only
Show answer

Correct answer: B

6
The character which can express only in homozygous condition in case of garden pea is
(A) Constricted pod
(B) Green seed colour
(C) Axial flower
(D) Yellow pod colour
  1. A A, B & D
  2. B A, C & D
  3. C B, C & D
  4. D A, B & C
Show answer

Correct answer: A

7
The incorrect statement with regard to Haemophilia is :-
  1. A A single protein involved in the clotting of blood is affected
  2. B It is a sex-linked disease
  3. C It is a recessive disease
  4. D It is a dominant disease
Show answer

Correct answer: D

8
A plant has genotype TtRrGgPP. On selfing of this plant, what is the sum total of phenotypic categories ?
  1. A 8
  2. B 16
  3. C 4
  4. D 27
Show answer

Correct answer: A

9
In Mendel's experiments with garden pea, round seed shape (RR) was dominant over wrinkled seed (rr), yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the $\mathrm{F_ { 2 }}$ generation of the cross RRYY × rryy ?
  1. A Only round seeds with green cotyledons
  2. B Only wrinkled seeds with yellow cotyledons
  3. C Only wrinkled seeds with green cotyledons
  4. D Round seeds with yellow cotyledons, and wrinkled seeds with yellow cotyledons
Show answer

Correct answer: D

10
The Punnett square shown below represents the pattern of inheritance in dihybrid cross when yellow $( \mathrm { Y } )$ is dominant over white ( y ) and round ( R ) is dominant over wrinkled (r) seeds.
Principles Of Inheritance And Variation – NEET-5023 A plant of type ' H ' will produce seeds with the genotype identical to seeds produced by the plants of :-
  1. A Type M
  2. B Type J
  3. C Type P
  4. D Type N
Show answer

Correct answer: D

11
Which is not true for test cross -
  1. A $\mathrm{F _ { 2 }}$ Dihybrid test cross ratio is $1 : 1 : 1 : 1$
  2. B Performed to know the alleles of a gene in an individual.
  3. C A test cross is a back cross
  4. D Dominant offsprings in test cross is always homozygous.
Show answer

Correct answer: D

12
Which one of the following is the most suitable medium for culture of Drosophila melanogaster ?
  1. A Moist bread
  2. B Agar-agar
  3. C Ripe banana
  4. D Cow dung
Show answer

Correct answer: C

13
Mendel proposed how many conclusions to consolidate his understanding of inheritance in monohybrid cross?
  1. A One
  2. B Two
  3. C Three
  4. D None of the rules, he proposed laws/ principles
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Correct answer: C

14
A certain road accident patient with unknown blood group needs immediate blood transfusion. His one doctor friend at once offers his blood. What was the blood group of the donor ?
  1. A Blood group O
  2. B Blood group A
  3. C Blood group B
  4. D Blood group AB
Show answer

Correct answer: A

15
Which of the following statement(s) is/are correct?
  1. A Crossing over occurs during mitosis in gametes.
  2. B Crossing over leads to the exchange of chromosomal segments.
  3. C Crossing over is done between non-sister chromatids of homologous chromosomes.
  4. D Both (A) and (C)
Show answer

Correct answer: A

16
Which of the following is not matched correctly?
  1. A Incomplete dominance - Exception of Mendel's first law
  2. B Co-dominance - Exception of law of purity of gametes
  3. C Multiple alleles - Studied in population
  4. D Linkage - Exception of independent assortment
Show answer

Correct answer: B

17
Identify the set of correct statement/s.
(a) Today genetic maps are extensively used as a starting point in genome sequencing in HGP.
(b) In Morgan's experiment's, wild type allele and mutant type allele are represented with (+) and (–) sign in superscript, respectively.
(c) Strength of linkage between Y and W is higher than W and M.
(d) Pleiotropy in most cases is the effect of a gene on metabolism pathways.
Choose the correct answer from the option given below :
  1. A (a), (b) and (d) only
  2. B (b), (c), (d) only
  3. C (a) and (d) only
  4. D (a), (b), (c) and (d) only
Show answer

Correct answer: C

18
In a plant gene ' A ' is responsible for tallness and its recessive allele ' $a$ ' for dwarfness and ' B ' is responsible for red flower colour and its recessive allele ' b ' for white flower colour. A tall and red flowered plant with genotype AaBb crossed with dwarf and red flowered (aaBb). What is the percentage of dwarf-white flowered offspring of above cross :-
  1. A $50 \%$
  2. B $6.25 \%$
  3. C $12.5 \%$
  4. D $50 \%$
Show answer

Correct answer: C

19
Mendel found that the $\mathrm{F _ { 1 }}$ always resembled either one of the parents and that the trait of the other parent was not seen in them. This is due to :-
  1. A Segregation
  2. B Dominance
  3. C Partial dominance
  4. D Unit factor
Show answer

Correct answer: B

20
In a plant flower colour is the example of quantitative trait and controlled by one gene pair. How many plants show parental phenotype in $\mathrm{F _ { 2 }}$ generation:-
  1. A $\frac { 2 } { 16 }$
  2. B $\frac { 2 } { 4 }$
  3. C $\frac { 2 } { 64 }$
  4. D $\frac { 2 } { 256 }$
Show answer

Correct answer: B

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