NEET : Multiple Choice questions: Linkage and Recombination

 

1. Who of the following is known as father of experimental genetics.

A. Gregor John Mendel
B. Thomas Hunt Morgan
C. Hugo de vries
D. Alfred sturtevant

Answer : B Explanation 

2. Consider the following sentences and select the number of  correct statements.

1. Morgan conducted several Dihybrid cross on Drosophila melanogaster.

2.   Morgan studied in Drosophila that some of the genetic were sex linked .

3. Dihybrid cross of Morgan were similar as Dihybrid cross of Mendel.
4. Morgan found ratio in F2 generation like Mendel of Dihybrid cross 

A. Two           B. Three

C. Four           D. One

Answer : B Explanation 

3. Which of the following pair is  not correctly matched with the reference of Morgan Experiment.

A. Conducted Dihybrid cross: Between Red eye, Brown body male  and white eye , yellow body female.

B. Tightly linked gene :  White and yellow wing .

C.Loosely linked gene :  White and miniature wing.

D. Phenotype ratio in Dihybrid cross : 9:3:3:1

Answer: D Explanation

4. Consider the following statement with the observation on basis of experiment conducted by Morgan and select  the correct code.

1. Morgan observed that two gene in Drosophila did not segregated independently.

2. Ratio of F2 generation was deviated from Mendel ratio 9:3:3:1

A. Only 1           

B. Only 2

C.Both 1 and 2

D.Neither 1 nor 2 

Answer : C Explanation

5. Which of the following statement is not correct 

A. When gene of characters are located  on same chromosome than these gene contribute much higher combination of parental gene.

B. The physical association between the gene on same chromosome called as linkage.

C.When gene of characters are located  on different chromosome than these gene contribute  less combination of parental gene.

D. If gene  of characters are not located on same chromosome than these gene contribute much higher combination of parental gene.

Answer: D Explanation

6. Which of the following statement is correct .

A. Term recombination refer to non parental combination.

B.Parental combination show high frequency if gene are tightly linked.

C.Parental combination show less frequency if gene are loosely linked.

D.Genes are found in group on same chromosome always loosely linked.

Answer: A Explanation

7. Consider the following statement with the observation on basis of experiment conducted by Morgan and select  the correct code.

1. Gene for white and yellow show 1.3 per cent of recombination. 

2. Gene for white and miniature wing show 37.2 per cent of recombination. 

A. Only 1           

B. Only 2

C. Both 1 and 2

D. Neither 1 nor 2

Answer: C Explanation

8. Who of the following used frequency of recombination of genetic pairs on same chromosome to measure the distance between gene and formulate" genetic map"

A. Alfred Wallace

B. Alfred Sturtevant 

C. Thomas Hunt Morgan

D. Gregor John Mendel

Answer: B Explanation

9. Who was Alfred Sturtevant?

A. Teacher of Morgan

B. Collaeauge of Morgan

C. Disciple of Morgan

D. Father of Morgan

Answer: C Explanation

10. Recent, Genetic map of  Alfred Sturtevant is used in 

A. DNA fingerprinting 

B. Recombinant DNA

C. Genome Project

D. Genetic disorder 

Answer: C Explanation

11. Drosophila can complete its life cycle about the 

A. 2 week

B. 3 week

C. 2 month

D. 3 month 

Answer : A Explanation

12. Consider the reasons to select fruit fly by Morgan for Experiment and select the correct code:

1. These fly can grow in synthetic medium in laboratory.

2.They can produce more number of progeny in single mating .

3.  Male and female fruit fly are easily distinguished.

4.Variations in Drosophila can observed with low power microscope.

A. 2, 3 and 4

B. 1, 3 and 4

C. 1, 2 and 3

D..1,2,3 and 4

Answer :D Explanation