Principles Of Inheritance And Variation — DPP 7

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
Extranuclear inheritance is a consequence of presence of genes in :-
  1. A Lysosomes and ribosomes
  2. B Mitochondria and chloroplasts
  3. C Endoplasmic reticulum and mitochondria
  4. D Ribosomes and chloroplasts
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Correct answer: B

2
A child is blood group is ' O '. His parents blood group cannot be :-
  1. A B and O
  2. B A and O
  3. C A B
  4. D A and B
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Correct answer: C

3
There are three genes $\mathrm { a } , \mathrm { b } , \mathrm { c }$ percentage of crossing over between a and b is $20 \% , \mathrm {~b}$ and c is $28 \%$ and a and c is $8 \%$. What is the sequence of genes on chromosome :-
  1. A b, a, c
  2. B a, b, c
  3. C a, c, b
  4. D None
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Correct answer: A

4
Pattern baldness in man is a :-
  1. A Autosomal character
  2. B Sex linked character
  3. C Sex influenced character
  4. D Both (A) and (C)
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Correct answer: D

5
In Drosophila crossing over occurs in female but not in male. Gene A and B are 10 map unit apart on chromosome. A female Drosophila with genotype $\frac { \mathrm { AB } } { \mathrm { ab } }$ and male Drosophila with genotype $\frac { \mathrm { AB } } { \mathrm { ab } }$. How many types of gametes are produced by female and male Drosophila, respectively :-
  1. A 4 types : 2 types
  2. B 2 types : 2 types
  3. C 4 types : 4 types
  4. D 4 types : one types
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Correct answer: A

6
In Mirabilis & Antirrhinum plant the appearance of the pink hybrid (Rr) between cross of a red (RR) and white (rr) flower parent indicates:
  1. A Incomplete dominance
  2. B Segregation
  3. C Dominance
  4. D Heterosis
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Correct answer: A

7
Which law would have been violated if Mendel had chosen eight characters in garden-pea :-
  1. A Law of dominance
  2. B Law of segregation
  3. C Law of independent assortment
  4. D Law of purity of gametes
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Correct answer: C

8
RR (red) is crossed with rr (white). All Rr offsprings are pink. This indicates that R-gene is :-
  1. A Hybrid
  2. B Incompletely dominant
  3. C Recessive
  4. D Mutant
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Correct answer: B

9
Cross over value $( \mathrm { COV } )$ of gene $\mathrm{A}$ and $\mathrm{B}$ is $5 \%$ while $\mathrm { COV }$ of genes $\mathrm{B}$ and $\mathrm{C}$ is $15 \%$ the possible sequence of these genes on chromosome is :-
  1. A $\mathrm{A - B - C}$
  2. B $\mathrm{C - A - B}$
  3. C $\mathrm{B - C - A}$
  4. D Both (A) and (B)
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Correct answer: D

10
In maize coloured endosperm (C) is dominant over colourless (c) and full endosperm (R) is dominant over shrunken (r). When a dihybrid of $\mathrm { F } _ { 1 }$-generation was test crossed it produced four phenotypes in the following percentage
Coloured and Full $= 45 \%$
Coloured - Shrunken $= 5 \%$
Colourless - Full $= 4\%$
Colourless - Shrunken $= 46 \%$
From these data what would be distance between the two non allelic genes :-
  1. A 48 unit
  2. B 9 unit
  3. C 4 unit
  4. D 12 unit
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Correct answer: B

11
Genetic Map is one that :-
  1. A Establishes sites of the genes on a chromosome
  2. B Establishes the various stages in gene evolution
  3. C Shows the stages during the cell division
  4. D Shows the distribution of various species in a region
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Correct answer: A

12
Which of the following material is good to understand incomplete dominance :-
  1. A Sweet Pea
  2. B Cattle
  3. C Snapdragon
  4. D Kernel colour in wheat
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Correct answer: C

13
A phenomenon which works opposite to the linkage is :-
  1. A Independent assortment
  2. B Crossing-over
  3. C Segregation
  4. D Mutation
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Correct answer: B

14
Which of the following is exception to Mendel's laws?
  1. A Linkage
  2. B Incomplete dominance
  3. C Co-dominance
  4. D All of the above
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Correct answer: D

15
The phenomenon of incomplete dominance was observed by :-
  1. A De Vries
  2. B Correns
  3. C Tschermak
  4. D None
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Correct answer: B

16
Multiple alleles are present :-
  1. A In different sex chromosomes
  2. B At different loci on chromosome
  3. C At the same locus on homologous chromosomes
  4. D At the non-homologous chromosomes
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Correct answer: C

17
A colourblind daughter is born when :-
  1. A Father is colourblind, mother is homozygous normal
  2. B Mother is colourblind, father is normal
  3. C Mother is carrier, father is normal
  4. D Mother is carrier, father is colourblind
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Correct answer: D

18
A colourblind man marries a daughter of colourblind father, then in the offspring :-
  1. A All sons are colourblind
  2. B All daughters are colourblind
  3. C Half sons are colourblind
  4. D No daughter is colourblind
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Correct answer: C

19
A woman with normal vision, but whose father was colour blind, marries a colourblind man. Suppose that the fourth child of this couple was a boy. This boy :-
  1. A Must have normal colour vision
  2. B May be colour blind or may be normal vision
  3. C Will be partially colour blind since he is hemizygous for the colour-blind mutant allele
  4. D Must be colour blind
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Correct answer: B

20
A gene that shows its effect on more than one character is :-
  1. A Polygene
  2. B Pleotropic gene
  3. C Multifactor gene
  4. D Multiple gene
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Correct answer: B

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