MCQOPTIONS
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MCQOPTIONS
This section includes 12 Mcqs, each offering curated multiple-choice questions to sharpen your Cytogenetics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
What will be the nature of curve with map distances plotted in X axis and percentage recombination in Y axis? |
| A. | Parallel to X axis |
| B. | Increasing in a straight line |
| C. | Parabolic |
| D. | Exponential |
| Answer» E. | |
| 2. |
Which of the following will result in parental phenotype? |
| A. | DCO in between two genes considering four strands |
| B. | Even number of DCO between two genes |
| C. | Odd number of DCO between two genes |
| D. | Single cross over at 4 strand stage between two genes |
| Answer» C. Odd number of DCO between two genes | |
| 3. |
In an experiment you calculate the expected DCO frequency to be 0.022 but in reality you observe that only 0.012 recombination frequency. What is the phenomenon resulting in this? |
| A. | Coincidence |
| B. | Interference |
| C. | Penitence |
| D. | Expressivity |
| Answer» C. Penitence | |
| 4. |
If single cross over frequency between two genes r and q and q and s in 3 point mapping is 0.6 and 0.2 respectively. What will be the expected double cross over frequency? |
| A. | 0.012 |
| B. | 0.010 |
| C. | 0.022 |
| D. | 0.024 |
| Answer» D. 0.024 | |
| 5. |
If a recombination event of three points crossing produces 6 DCO, 142 SCO and 352 NCO. What will be the percentage cross over between the terminal genes. |
| A. | 10% |
| B. | 20.8% |
| C. | 14.8% |
| D. | 30.8% |
| Answer» E. | |
| 6. |
Double cross over involving ________ strands result in 100% recombinant strands. |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 7. |
Is two crossovers occur between same two strands, this will result in__________ |
| A. | All recombinant strands |
| B. | Three recombinant strands with different loci exchanged |
| C. | Exchange of middle portion between two strands |
| D. | Exchange of ends |
| Answer» D. Exchange of ends | |
| 8. |
If two genes are unlinked the recombination frequency will be? |
| A. | 25% |
| B. | 50% |
| C. | 75% |
| D. | 100% |
| Answer» C. 75% | |
| 9. |
How many rounds of replication in BrdU will be needed to visualize Harlequin chromosome? |
| A. | Single |
| B. | Two |
| C. | Three |
| D. | Four |
| Answer» C. Three | |
| 10. |
Chiasmatype theory states recombination occurs before chiasma formation. State whether it is true or false. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 11. |
Consider that recombination occurs in 2 strand stage of meiosis. If a Drosophila is heterozygous for the bar locus what will be the result of recombination? |
| A. | The recombination will make them homozygous |
| B. | It will produce ultra bar phenotype |
| C. | It will be heterozygous |
| D. | No exchange |
| Answer» D. No exchange | |
| 12. |
Bar is a gene often used in recombination study. Which of the following is true for the Bar gene? |
| A. | It is normally present in two copies |
| B. | Three copies of bar are called ultra bar |
| C. | Heterozygous bar females have a less severe effect than homozygous bar female |
| D. | Homozygous bar are of common occurrence |
| Answer» C. Heterozygous bar females have a less severe effect than homozygous bar female | |