Principles Of Inheritance And Variation — DPP 12

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.

Attempt this test free 20 questions · 30 minutes · +80 marks
1
Given below is the pedigree of sickle cell anaemia, in a family : In this the RBC of both parents will be:
Principles Of Inheritance And Variation – NEET-4800
  1. A Normal
  2. B Sickle shaped
  3. C Both normal & sickle shaped
  4. D Cannot be determined
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Correct answer: C

2
If $\mathrm { F } _ { 1 }$ individual of genotype (Tt) go through sexual reproduction, then it's gamete (pollen grain) with genotype (T) have what chances to pollinate eggs of the genotype (T)?
  1. A $25 \%$
  2. B $50 \%$
  3. C $75 \%$
  4. D $100 \%$
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Correct answer: B

3
The linkage map of X-chromosome of fruit fly has 66 map units, with yellow body gene (y) at one end and bobbed hair (b) gene at the other end. The recombination frequency between these two genes (y and b) should be:-
  1. A $60 \%$
  2. B $> 50%$
  3. C $\leq 50 \%$
  4. D $100 \%$
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Correct answer: C

4
A dihybrid plant on self pollination, produced 400 seeds with 9 types of genotype. How many seeds will have genotype TtRr ?
  1. A 200
  2. B 100
  3. C 50
  4. D 150
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Correct answer: B

5
Polymerisation of mutant haemoglobin molecule in sickle cell anaemia is due to :-
  1. A Sulphadrugs
  2. B High oxygen
  3. C Low oxygen concentration
  4. D Plasmodium falciparum
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Correct answer: C

6
Out of three characters on chromosome no. 4, two characters indicate linkage and not mentioned by Mendel. These characters were:-
  1. A Pod shape - stem length
  2. B Pod shape - seed colour
  3. C Pod shape - pod colour
  4. D Pod colour - stem length
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Correct answer: A

7
Which of the following is not observed in a monohybrid cross?
  1. A Recessive parental trait is expressed without any blending in the $\mathrm{F _ { 2 }}$-generation
  2. B Recessive parental trait is expressed without any blending in the $\mathrm{F _ { 1 }}$-generation
  3. C Dominance also explains the proportion of $3 : 1$ obtained at the $\mathrm{F _ { 2 }}$
  4. D Genotype ratio is $1 : 2 : 1$
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Correct answer: B

8
In pedigree analysis symbol ⊙ is used for :-
  1. A Heterozygous for autosomal recessive
  2. B Affected individuals
  3. C Death
  4. D Carrier for sex linked recessive
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Correct answer: D

9
When a cross is made between tall plant with yellow seed (TtYy) and tall plant with green seed (Ttyy), what proportion of phenotype in the offspring could be expected to be tall and green :-
  1. A $25 \%$
  2. B $12.5 \%$
  3. C $37.5 \%$
  4. D $50 \%$
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Correct answer: C

10
Female heterogamety can be seen in :-
  1. A Human beings
  2. B Drosophila
  3. C Hen
  4. D Honey bees
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Correct answer: C

11
In which organism female is homogametic and also has one chromosome more than male?
  1. A Birds
  2. B Drosophila
  3. C Chicks
  4. D Grasshopper
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Correct answer: D

12
A plant with genotype AABbCcDD is self pollinated. Provided that the four genes are independently assorting, what proportion of the progeny will show the genotype AAbbccDD ?
  1. A $\frac { 1 } { 4 }$
  2. B $\frac { 1 } { 16 }$
  3. C $\frac { 1 } { 64 }$
  4. D $\frac { 1 } { 256 }$
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Correct answer: B

13
A true breeding line is that :-
  1. A Having undergone continuous cross pollination
  2. B Having undergone continuous selfpollination
  3. C Having undergone continuous vegetative propagation
  4. D Obtained through meristem tissue culture
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Correct answer: B

14
Study the pedigree given below and assign the type of inheritance of the trait :-
Principles Of Inheritance And Variation – NEET-4799
  1. A X-linked recessive
  2. B Y-linked
  3. C autosomal recessive
  4. D autosomal dominant
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Correct answer: C

15
Morgan and his group found that when genes were grouped on the same chromosome, some genes were very tightly linked and showed :-
  1. A Very low recombination
  2. B Higher recombination
  3. C No recombination
  4. D $100 \%$ parental combination
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Correct answer: A

16
Which of the following was/were applied first time to problems in biology during Mendel's investigations into inheritance?
  1. A Statistical analysis
  2. B Mathematical logic
  3. C Computational devices
  4. D Both (A) and (B)
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Correct answer: D

17
Mendel published his work in 1865 but it remained unrecognised till 1900 . Which of the following reasons was not responsible for it?
  1. A Communication was not easy
  2. B His concept of genes (factors) as stable and discrete unit was not accepted by his contemporaries as an explanation for apparently continuous variations
  3. C Use of mathematics to explain biological phenomenon
  4. D Use of emasculation technique
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Correct answer: D

18
In a large number of insects the mechanism of sex determination is of :-
  1. A XO type
  2. B XY type
  3. C ZW type
  4. D All the above
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Correct answer: A

19
The colour based characters in seven characters studied by Mendel in pea were:-
  1. A 1
  2. B 2
  3. C 3
  4. D 4
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Correct answer: C

20
Polydactyly in man is due to :-
  1. A autosomal dominant gene
  2. B autosomal recessive gene
  3. C sex - linked dominant gene
  4. D sex - linked recessive gene
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Correct answer: A

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