NEET : Multiple Choice questions: Mendel 's Law of Inheritance

 

1. Considered the following  sentences and select the correct  code with respect to Law of Dominance given by the Mendel.

1. Characters are controlled by the discrete unit called factors which are found in pair.

2. In a dissimilar pair of factor or allele, one allele is dominant over the other.

3. Law of Dominance explain the appearance of one parental character in first generation and appearance of both characters in Second generation.

4. Law of Dominance was based on Monohybrid cross.

A. 1, 2 and 3      B. 2, 3 and 4

C. 1,3 and 4       D. 1,2,3 and 4

Answer : D Explanation 

2. What is the phenotypic ratio in F2 generation of  Law of Dominance given by the Mendel.

A. 2 : 1                B. 3 : 1 

C. 1 : 1            D.1 :2 : 1

Answer : B Explanation

3. What was alleles that formed   in F2 generation of  Law of Dominance given by the Mendel.

A. Tt : Tt         B. TT : tt

C. TT : Tt : tt.  D. Tt :  tt

Answer : C Explanation

4. Which of the following explain that factors or allele are separated in such a way that a gamete recieve only one allele out of two. 

A. Incomplete dominance 

B. Law of Dominance 

C. Law of segregation 

D. Law of independent assortment

Answer :   C  Explanation

5. Which of the following law of inheritance given by Mendel was based on Dihybrid cross.

A. Law of Dominance 

B. Law of segregation 

C. Law of independent assortment

D. All of the above

Answer :   C  Explanation.

6. What was the phenotypic ratio in F2 generation of  Law of independent assortment given by the Mendel.

A. 2: 2 : 1  :1             

B. 9 : 3 : 3 : 1 

C. 1 : 3 : 3 : 9              

D. 1 : 2 : 1 : 1

Answer : B Explanation

7. The number of hybrid in F2 generation that were formed in Dihybrid cross that led  law of independent assortment.

A. Sixteen

B. Thirty two 

C. Sixty four

D. Eight

Answer : A Explanation

8. What are the  number of Round green seed and wrinkled yellow seed  in F2 generation that were formed in Dihybrid cross that led  law of independent assortment.

A. 9 and 3      B. 3 and 3

C. 1 and 3      D. 3 and 9

Answer : B Explanation

9. What are the  number of Round yellow seed  in F2 generation that were formed in Dihybrid cross that led  law of independent assortment.

A. Three         B. One

C. Nine           D. Sixteen

Answer : A Explanation

9. What are the total number of hybrids  in F2 generation that were formed in Dihybrid cross that led  law of independent assortment.

A. Three         B. One

C. Nine           D. Sixteen

Answer : D Explanation

10. Which one of the following types of seed is formed one in number in F2 generation that were formed in Dihybrid cross that led  law of independent assortment.

A. Round yellow         

B. Round green

C. Wrinkled yellow          

D. Wrinkled green

Answer : D Explanation

11. When two pairs of trait are combined in hybrid than one pair of trait is segregated from other pair of characters. This law states  

A. Law of Dominance 

B. Law of segregation 

C. Law of independent assortment

D. All of the above

Answer :   C  Explanation.

12. In a typical Dihybrid cross,  64 hybrids are formed. What are the number of wrinkled green seed.

A. Thirty six   B.Twelve 

C. Four         D. Twenty four

Answer : C Explanation

13. The cross between the hybrid (Tt) and Either of the parents whether tall (TT) and dwarf (tt) is called 

A. Criss cross 

B. Test cross 

C. Back cross

D. Non cross

Answer : C Explanation

14. Which one of the following cross is not a back cross.

A. Tt x tt            B.Rr x RR

C. Rr x Rr          D.Tt x TT

Answer : C Explanation

15. What is the ratio of  back cross.

A. 3 : 1          B. 1 : 1

C. 1 : 3          D. 9 : 1

Answer : B Explanation

16. Which one of the following statement is not correct.

A. Test cross can be a back cross.

B. To know the genotype of Tall plant in F2 generation, test cross is done.

C. It has been crossed between recessive parent and either homozygous tall and heterozygous tall.

D. The phonotypic ratio of test cross will be 1 : 1 in both cross : TT x tt and Tt x tt.

Answer : D Explanation

17. A cross between Tt x tt signifies

A. Test cross

B. Back cross

C. Criss cross

D. Both Test and back cross

Answer : D Explanation

18. In a typical test cross, dwarf plant is crossed with which of the following genotype.

A. Tt  only                  

B. TT only

C. Both TT and Tt

D. tt only 

Answer : D Explanation

19. To know the genotype of tall plant in F2 generatio which of the following cross is done.

A. Test cross

B. Back cross

C. Criss cross

D. Both test and back cross

Answer : A Explanation

20.  In which of the following cross, half of flower are white and half of the flower is violet. 

A. W w and W W

B. W w and w w

C. T t and T T

D. R r and RR 

Answer : B Explanation