Principles Of Inheritance And Variation — DPP 14

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
Due to the cross between TTRr × ttrr the resultant progenies showed how many percent plants would be, tall, red flowered:-
  1. A $50 \%$
  2. B $75 \%$
  3. C $25 \%$
  4. D $100 \%$
Show answer

Correct answer: A

2
Which of the following is not a Mendelian disorder ?
  1. A Haemophilia
  2. B Cystic fibrosis
  3. C Cry-du-chat syndrome
  4. D Sickle cell anaemia
Show answer

Correct answer: C

3
In Mirabilis jalapa when homozygous red flowered and white flowered plants are crossed, all $\mathrm{F _ { 1 }}$ plants have pink coloured flowers. In $\mathrm{F _ { 2 }}$ produced by selfing of $\mathrm{F _ { 1 }}$ plants, red, pink, white flowered plants would appear respectively in the ratio of :-
  1. A $1 : 1 : 2$
  2. B $2 : 1 : 1$
  3. C $1 : 0 : 1$
  4. D $1 : 2 : 1$
Show answer

Correct answer: D

4
If one parent has blood group A and the other parent has blood group B. The offsprings have which blood group :-
  1. A AB only
  2. B O only
  3. C B only
  4. D A, B, AB, O
Show answer

Correct answer: D

5
Complete linkage is found in :-
  1. A Birds
  2. B Snakes
  3. C Female - Drosophila
  4. D Male - Drosophila
Show answer

Correct answer: D

6
A person with unknown blood group under ABO system, has suffered much blood loss in an accident and needs immediate blood transfusion. His one friend who has a valid certificate of his own blood type, offers for blood donation without delay. What would have been the type of blood group of the donor friend?
  1. A Type B
  2. B Type AB
  3. C Type O
  4. D Type A
Show answer

Correct answer: C

7
Chromosomal disorders arise due to :-
  1. A Absence of one or more chromosomes
  2. B Excess of one or more chromosomes
  3. C Abnormal arrangement of one or more chromosomes
  4. D All the above
Show answer

Correct answer: D

8
Blood grouping in humans is controlled by:-
  1. A 4 alleles in which $\mathrm { I } ^ { \mathrm { A } }$ is dominant
  2. B 3 alleles in which $\mathrm { I } ^ { \mathrm { A } }$ and $\mathrm { I } ^ { \mathrm { B } }$ are dominant
  3. C 2 alleles in which none is dominant
  4. D 3 alleles in which $\mathrm { I } ^ { \mathrm { A } }$ is recessive
Show answer

Correct answer: B

9
In some insect's half of the sperms possess X chromosome along with autosomes while half of the sperms carries :-
  1. A Only autosomes
  2. B y chromosome along with autosome
  3. C x chromosome only
  4. D x chromosome along with autosomes
Show answer

Correct answer: A

10
A human male is heterozygous for autosomal gene A, B and G. He is also hemizygous for haemophilic gene h. What proportion of his sperm will be abgh:-
  1. A $\frac { 1 } { 4 }$
  2. B $\frac { 1 } { 8 }$
  3. C $\frac { 1 } { 16 }$
  4. D $\frac { 1 } { 32 }$
Show answer

Correct answer: C

11
Sickle cell anaemia is :-
  1. A Characterized by elongated sickle like RBCs with a nucleus.
  2. B An autosomal linked dominant trait.
  3. C Caused by substitution of valine by glutamic acid in the beta globin chain of haemoglobin.
  4. D Caused by a change in a single base pair of DNA.
Show answer

Correct answer: D

12
A test cross of $\mathrm{F _ { 1 }}$ flies $a + / + b$ produced the following offspring
$\begin{array}{l}++/ a b=9 \quad a b / a b=9 \\ +b / a b=41 \quad a+/ a b=41\end{array}$
What will be distance between linked gene?
  1. A 82 cM
  2. B 18 cM (cis)
  3. C 20 cM
  4. D 18 cM (trans)
Show answer

Correct answer: D

13
A scientist performed the gene mapping experiments in maize. He mapped the genes on chromosomes on the basis of % crossing over between different genes. One map unit corresponds to one % crossing over or recombination. The genes showing more than $50 \%$ recombination were not supposed to be linked on same chromosome. In crossing over studies on maize, scientist observed the following % crossing over between genes $\mathrm { A } , \mathrm { B } , \mathrm { C } , \mathrm { D }$ between A and D 10%, between A and C 3%, between genes C and D 7 %, between genes A and B 5%, and between genes C and B 8%. On the basis of above observation find out the correct sequence of genes A, B, C and D on chromosomes:-
  1. A $\mathrm{BCDA}$
  2. B $\mathrm{A B C D}$
  3. C $\mathrm{BACD}$
  4. D $\mathrm{DACB}$
Show answer

Correct answer: C

14
Depending upon the distance between any two genes which is inversely proportional to the strength of linkage, cross overs will vary from :-
  1. A $50 - 100 \%$
  2. B $0 - 50 \%$
  3. C $75 - 100 \%$
  4. D $100 - 150 \%$
Show answer

Correct answer: B

15
Which of the following symbol is used for mating between relatives (Consanguineous mating)?
  1. A
  2. B
  3. C
  4. D
Show answer

Correct answer: C

16
Albinism is determined by a recessive gene in man. The presence of albinism in 50\% children born to a couple proves that :-
  1. A Both parents are heterozygous for albinism
  2. B Father is homozygous normal and mother is heterozygous
  3. C Father is homozygous for albinism but mother is heterozygous
  4. D Both are homozygous
Show answer

Correct answer: C

17
Which is incorrect ?
(i) ABO blood groups are controlled by the gene-I
(ii) Gene I has four alleles
(iii) $\mathrm { I } ^ { \mathrm { A } }$ and $\mathrm { I } ^ { \mathrm { B } }$ produce same type of sugar
(iv) i or $\mathrm { I } ^ { \circ }$ produce different type of sugar
(v) $\mathrm { I } ^ { \mathrm { A } }$ and $\mathrm { I } ^ { \mathrm { B } }$ are incomplete dominant
  1. A i, ii
  2. B v, ii
  3. C ii, iii, iv
  4. D ii, iii, iv, v
Show answer

Correct answer: D

18
Recessive traits are seen due to :-
  1. A Formation of non-functional enzyme
  2. B Enzyme is not produced
  3. C Both (A) and (B)
  4. D Formation of functional enzyme
Show answer

Correct answer: C

19
A polygenic trait is controlled by 3 polygenes $\mathrm { A } , \mathrm { B }$ and C . In a cross $\mathrm { AaBbCc }$ $\times$ $\mathrm { AaBbCc }$, the phenotypic ratio of the offsprings was observed as :-
$1 : 6 : x : 20 : x : 6 : 1$
what is the possible value of $x$ ?
  1. A 3
  2. B 9
  3. C 15
  4. D 25
Show answer

Correct answer: C

20
The weight of fruit in a plant is determined by the number of dominant alleles of a certain number of genes. If seven weight categories are noticed, how many gene sites would be involved?
  1. A two
  2. B three
  3. C four
  4. D five
Show answer

Correct answer: B

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