OBJECTIVE & FILL IN THE BLANKS OF LINKAGE AND CROSSING OVER
Multiple Choice Questions (MCQs)
I. The phenomenon in which genes are present on the same chromosomes is:
(a) Cross over (b) Segregation (c) Linkage(d) assortment
- The linked gene does not follow:
(a) Cross over (b) Segregation (c) Linkage(d) assortment
- The linkage groups in man are:(a) 46 (b) 23 (c) 22 (d) 24
- The linkage group of sickle cell anemia, leukemia and albinism is present on chromosome:
(a) 10 (b) 11 (c) 12 (d) 13
- The gene linkage minimize the chances of: (a) Cross over (b) Segregation(c) recombination(d) assortment
- Gene A and B are linked gene. Which of following gametes show recombination?
(a) AB (b) ab (c) Ab (b) ab
- There is 30% recombination frequency between two genes. The distance between them in unit map is:
(a) 15 (b) 30 (c) 60 (d) 80
- There are 80% parental and 20% recombinant in a cross. Its recombinant frequency is:
(a) 10% (b) 20% (c) 40% (d) 80%
Answers:I. (c) 2. (d) 3. (b) 4. (b) 5. (c) 6. (a) 7. (b) 8. (b)
Fill in blanks
- All the genes located on the same chromosome are linked to
each other. This phenomenon of staying together of all the
genes of a chromosome is called______________
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- A chromosome carries its linked genes en bloc in the form of a______________.
- The exchange of segments between non-sister chromatids of homologous chromosomes during meiosis is called___________.
- Linked genes can be separated by______________
- Two genes are strongly linked if they have closer gene__________.
- The proportion of recombinant types between two gene pairs as compared to the sum of all combinations is called cross over or_____________ frequency.
- The two linked genes A and B with a 20% recombinationfrequency must be____________ apart.
- Crossing over produces genetic___________ among offspring.
- Ans:
1. Linkage 2. linkage group3. crossing over 4. crossing over
5. loci 6. recombination7. 20 8. variation
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