MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 19 Mcqs, each offering curated multiple-choice questions to sharpen your Genetics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In transgenics, alterations in the sequence of uncleotide in genes are due to |
| A. | P and Q |
| B. | P, Q and R |
| C. | Q and R |
| D. | R and S |
| Answer» C. Q and R | |
| 2. |
True breeding Drosophila flies with curved wings and dark bodies were mated with true breeding short wings and tan body Drosophila. The F1 progeny was observed to be with curved wings and tan body. The F1 progeny was again allowed to breed and |
| A. | Typical Mendelian with curved wings and tan body being dominant |
| B. | Typical non-Mendelian with curved wings and tan body not following any pattern |
| C. | Mendelian with suppression of phenotypes |
| D. | Mendelian with single crossover |
| Answer» B. Typical non-Mendelian with curved wings and tan body not following any pattern | |
| 3. |
The value of standard deviation (SD) will be |
| A. | 0.061 |
| B. | 0.25 |
| C. | 0.61 |
| D. | 0.85 |
| Answer» C. 0.61 | |
| 4. |
In a relatively large but finite and closed population of sexually reproducing diploid organisms, the frequency of homozygous genotype PP changes from 0.40 to 0.50 and that of pp changes from 0.40 to 0.41 in a span of 10 generations. Which of the following is the most likely cause for the above change in frequency of the PP genotype? |
| A. | Non-random mating |
| B. | Random genetic drift |
| C. | Selection |
| D. | Combination of non-random mating and random genetic drift |
| Answer» D. Combination of non-random mating and random genetic drift | |
| 5. |
A crossing was performed between the genotypes |
| A. | 1.3 to 1.8 |
| B. | 4.1 to 5.6 |
| C. | 3 |
| D. | None of the above |
| Answer» B. 4.1 to 5.6 | |
| 6. |
A heterozygous tall plant (Tt) was crossed with a homozygous dwarf plant (tt). The resultant seeds were collected. If five seeds are chosen at random, then the probability (in %) that exactly two of these seeds will yield dwarf plants is ______. |
| A. | 11% |
| B. | 31% |
| C. | 41% |
| D. | 21% |
| Answer» C. 41% | |
| 7. |
Match the type of chromosomal inheritance (Column-I) with the corresponding genetic disease or trait (Column-II). |
| A. | P-1 , Q-4 , R-3 , S-2 |
| B. | P-4 , Q-3 , R-2 , S-1 |
| C. | P-3 , Q-1 , R-4 , S-2 |
| D. | P-4 , Q-2 , R-3 , S-1 |
| Answer» D. P-4 , Q-2 , R-3 , S-1 | |
| 8. |
Hypophosphatemia is manifested by an X-linked dominant allele.What proportion of the offsprings from a normal male and an affected heterozygous female will manifest the disease? |
| A. | sons and daughters |
| B. | all daughters and no sons |
| C. | all sons and no daughters |
| D. | daughters and sons |
| Answer» B. all daughters and no sons | |
| 9. |
Of the two diploid species, species I has 36 chromosomes and species II has 28 chromosomes. How many chromosomes would be found in an allotriploid individual? |
| A. | 42 or 54 |
| B. | 46 or 50 |
| C. | 74 or 86 |
| D. | 84 or 108 |
| Answer» C. 74 or 86 | |
| 10. |
A dioecious plant has XX sexual genotype for female and XY for male. After double fertilization, what would be the genotype of the embryos and endosperms? |
| A. | 100% ovules will have XXX endosperm and XX embryo |
| B. | 100% ovules will have XXY endosperm and XY embryo |
| C. | 50% ovules will have XYY endosperm and XY embryo |
| D. | while other 50% will have XXY endosperm and YY embryo |
| Answer» E. | |
| 11. |
In a genetic cross between the genotypes WWXX and wwxx, the following phenotypic distributions were observed among the F |
| A. | Relative position: W-X-Y Distances: W-X = 5 map units, X-Y = 17 map units |
| B. | Relative position: X-Y-W Distances: X-Y = 15 map units, Y-W = 11 map units |
| C. | Relative position: Y-W-X Distances: Y-W = 5 map units, W-X = 11 map units |
| D. | Relative position: X-W-Y Distances: X-W = 5 map units, W-Y = 10 map units |
| Answer» D. Relative position: X-W-Y Distances: X-W = 5 map units, W-Y = 10 map units | |
| 12. |
Consider a population of 10,000 individuals, of which 2500 are homozygotes (PP) and 3000 are heterozygotes (Pp) genotype. The frequency of allele p in the population is ______. |
| A. | 3.671 |
| B. | 0.671 |
| C. | 5.71 |
| D. | None of the above |
| Answer» C. 5.71 | |
| 13. |
What will be the probability of having the colour-blind daughter to a phenotypically normal woman, who already had one colour-blind son, and is married to a colour-blind man? |
| A. | 75 % |
| B. | 50 % |
| C. | 25 % |
| D. | 15 % |
| Answer» C. 25 % | |
| 14. |
What will be the probability of having the colour-blind son to a woman with phenotypically normal parents and a colour-blind brother, and married to a normal man? (Assume that she has no previous children) |
| A. | 100 % |
| B. | 50 % |
| C. | 25 % |
| D. | 12.5 % |
| Answer» C. 25 % | |
| 15. |
A disease is inherited by a child with a probability of 1 .4 |
| A. | <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td><td rowspan="2"> </td></tr><tr><td style="text-align: center;">4</td></tr></table> |
| B. | <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>3</center></td><td rowspan="2"> </td></tr><tr><td style="text-align: center;">8</td></tr></table> |
| C. | <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>7</center></td><td rowspan="2"> </td></tr><tr><td style="text-align: center;">16</td></tr></table> |
| D. | <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>9</center></td><td rowspan="2"> </td></tr><tr><td style="text-align: center;">16</td></tr></table> |
| Answer» C. <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>7</center></td><td rowspan="2"> </td></tr><tr><td style="text-align: center;">16</td></tr></table> | |
| 16. |
Match the terms in Group I with the ploidy in Group II. |
| A. | P- 4 , Q-2 , R- 3 , S-1 |
| B. | P- 4 , Q-3 , R- 1 , S- 2 |
| C. | P- 2 , Q-3 , R- 4 , S-1 |
| D. | P- 1 , Q-4 , R- 3 , S- 2 |
| Answer» B. P- 4 , Q-3 , R- 1 , S- 2 | |
| 17. |
Diploid Drosophila has eight chromosomes. Which one of the following terms should NOT be used to describe Drosophila with sixteen numbers of chromosomes? |
| A. | Polyploid |
| B. | Aneuploid |
| C. | Euploid |
| D. | Tetraploid Common |
| Answer» C. Euploid | |
| 18. |
PKU is one of the best known hereditary disorders in amino acid metabolism. The defect is attributed to a lesion in one of the following enzymatic activities |
| A. | Phenylalanine ammonia lyase |
| B. | Phenylalanine hydroxylase |
| C. | Tryosine hydroxylase |
| D. | Phenylalanine transaminase |
| Answer» C. Tryosine hydroxylase | |
| 19. |
Some of the genes from viruses introduced into plants in fully functional form often exhibit Mendelian inheritance because |
| A. | the genes are stably integrated in chromosomes |
| B. | the genes are stably maintained in vectors |
| C. | the genes are co-expressed with chromosomal genes |
| D. | the genes are not interrupted by introns |
| Answer» B. the genes are stably maintained in vectors | |