MCQ on Linkage and Crossing Over: Biology is one of the most important and vital sections in NEET. It includes theories, descriptions, discoveries, diagrams, definitions, explanation of differences and relations. Most of the concepts covered in the NEET syllabus are from the NCERT syllabus of Class 11 & 12. Other related sources make up for the rest of the syllabus.

In this post we are providing you MCQ on Linkage and Crossing Over, which will be beneficial for you in upcoming NEET, AIIMS, JIPMER, PGIMER, CBSE Board, ICSE Board, Class 12th, 11th.

MCQ on Linkage and Crossing Over

Q1. If the percentage of crossing over between two genes is 10, then the distance between two genes will be ________.
a) 5 morganoid
b) 10 morgan
c) 20 centimorgans
d) 40 map units

Q2. In a linear chromosome map distance between 4 loci is as follows a-b is 10%, a-d is 3%, b-c is 4% and a-c is 6%. The crossover frequency between c and d is ________.
a) 4-12%
b) 3-6%
c) 9%
d) 3%

Q3. Crossing-over takes place in the ________.
a) Diakinesis stage
b) Anaphase stage
c) Pachytene stage
d) Leptotene stage

Q4. Repulsion and coupling are two faces of ________.
a) mutation
b) chiasmata
c) linkage
d) crossing over

Q5. ________ is the reason why Mendel did not recognize linkage phenomenon in his experiments.
a) he studied only pure plants
b) he did not have a powerful microscope
c) characters he studied were situated on different chromosomes
d) many chromosomes to handle

Q6. There are 4 pairs of chromosomes in a Drosophila. The linkage groups present in it are ________.
a) one more than the pair of chromosomes
b) one less than the pair of chromosomes
c) four
d) eight

Q7. Where does this evidence come from? – crossing over takes place at a four-stranded stage and not at two stranded stages of chromosomes.
a) studies on linkage maps of chromosomes in Drosophila
b) studies of meiosis in maize
c) 4:4 organization of ascospores in Neurospora
d) 2:2:2:2 organization of ascospores in Neurospora

Q8. Alleles of different genes that are on the same chromosome can occasionally be separated by a phenomenon called ________.
a) crossing over
b) continuous variation
c) epistasis
d) pleiotropy

Q9. If gene frequency between genes a and c is 2%; b and c is 13%; b and d 4%; a and b 15%; c and d 17 and a and d 19%. The sequence of genes in a chromosome is ________.
a) a,d,b,c
b) d,b,a,c
c) a,b,c,d
d) a,c,b,d

Q10. Percentage of crossing over is more when ________.
a) genes are located in a different cell
b) genes are not linked
c) linked genes are located close to each other
d) linked genes are located far apart from each other

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