MCQOPTIONS
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MCQOPTIONS
This section includes 19 Mcqs, each offering curated multiple-choice questions to sharpen your Cytogenetics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In case of summer squash, the W locus shows dominant epistasis over the Y locus. W locus develop white colour while /- give yellow and y/y gives green. If you cross a yellow and a green summer squash you can’t get______________ |
| A. | Yellow |
| B. | Green |
| C. | White |
| D. | You can get all |
| Answer» D. You can get all | |
| 2. |
Dominant epistasis ratio with A as epistatic gene 12:3:1 corresponds to ________________ |
| A. | A/- B/- : A/- b/b : a/a B/- |
| B. | a/a B/- : a/a b/b : a/a b/- |
| C. | A/A B/-: A/- B/-: a/a b/b |
| D. | A/- -/- : a/a B/-: a/a b/b |
| Answer» E. | |
| 3. |
In case of dominant epistasis which of the following will have the same expression, when A is the epistatic locus? |
| A. | A/a B/b and a/a B/b |
| B. | A/A b/b and A/A B/b |
| C. | a/a b/b and A/a b/b |
| D. | a/a b/b and a/a B/B |
| Answer» C. a/a b/b and A/a b/b | |
| 4. |
Epistasis can produce a ratio of 12:3:1. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 5. |
EPISTASIS_CAN_PRODUCE_A_RATIO_OF_12:3:1.?$ |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6. |
Dominant epistasis ratio with A as epistatic gene 12:3:1 corresponds to ________________$ |
| A. | A/- B/- : A/- b/b : a/a B/- |
| B. | a/a B/- : a/a b/b : a/a b/- |
| C. | A/A B/-: A/- B/-: a/a b/b |
| D. | A/- -/- : a/a B/-: a/a b/b |
| Answer» E. | |
| 7. |
In_case_of_dominant_epistasis_which_of_the_following_will_have_the_same_expression,_when_A_is_the_epistatic_locus?$ |
| A. | A/a B/b and a/a B/b |
| B. | A/A b/b and A/A B/b |
| C. | a/a b/b and A/a b/b |
| D. | a/a b/b and a/a B/B |
| Answer» C. a/a b/b and A/a b/b | |
| 8. |
In case of summer squash which of the following is not right. |
| A. | The W allele produces a White substance |
| B. | A white substance is converted to Yellow when dominant Y allele is present |
| C. | The transformation of white substance to yellow is via green intermediate |
| D. | The green intermediate has combination at the Y locus y/y |
| Answer» B. A white substance is converted to Yellow when dominant Y allele is present | |
| 9. |
In case of summer squash, the W locus shows dominant epistasis over the Y locus. W locus develop white colour while /- give yellow and y/y gives green. If you cross a yellow and a green summer squash you can’t get______________$ |
| A. | Yellow |
| B. | Green |
| C. | White |
| D. | You can get all |
| Answer» D. You can get all | |
| 10. |
Which of the following is incorrect about the graying of coat colour of horse? |
| A. | The graying is a case of dominant epistasis |
| B. | The colour of the fur and skin gradually turns grey |
| C. | The G/G or G/g shows greying |
| D. | Coat colour of horse with G/- combination will grey irrespective of what was its colour to start with |
| Answer» C. The G/G or G/g shows greying | |
| 11. |
Which one of the following is not the case of epistasis? |
| A. | Fur colour in mouse |
| B. | Fruit colour in summer squash |
| C. | Fruit shape in summer squash |
| D. | Coat colour in labrador |
| Answer» D. Coat colour in labrador | |
| 12. |
Coat colour in Labrador retriever is controlled by epistasis. B specifies black pigment, b is for brown pigment (recessive) and E locus determines the expression of B locus. Which one of the following is wrong? |
| A. | bb EE gives yellow |
| B. | Bb EE gives black |
| C. | bb Ee gives brown |
| D. | BB EE gives black |
| Answer» B. Bb EE gives black | |
| 13. |
Which one of the following has dominant allele in both gene locus? |
| A. | Black |
| B. | Albino |
| C. | Agouti |
| D. | White |
| Answer» D. White | |
| 14. |
The cross between a white mouse and a black mouse _______________ |
| A. | Can’t give a Black mouse |
| B. | Can’t give a White mouse |
| C. | Can’t give a Agouti mouse |
| D. | Can give all combinations |
| Answer» E. | |
| 15. |
In mouse agouti locus is hypostatic to pigment development locus. If C is for pigment development, and A is for agouti, and recessive alleles in agouti locus gives black colour and recessive in pigment locus gives white colour, what will be the phenotype of A/- c/c and a/a c/c. |
| A. | Agouti, white |
| B. | Black, agouti |
| C. | Black, black |
| D. | White, white |
| Answer» E. | |
| 16. |
What is the dihybrid phenotypic ratio for recessive epistasis in an F22 generation? |
| A. | 9:3:3:1 |
| B. | 9:6:1 |
| C. | 9:3:4:1 |
| D. | 9:3:4 |
| Answer» E. | |
| 17. |
Epistasis is the interaction between two genes producing a new phenotype. |
| A. | True |
| B. | False |
| Answer» C. | |
| 18. |
Epistasis is the interaction between_____________ genes. |
| A. | 2 |
| B. | 4 |
| C. | 8 |
| D. | 16 |
| Answer» B. 4 | |
| 19. |
In case of two gene interaction, the gene which is masking the expression of another is called_____________ and the gene whose expression is masked is called_______________ |
| A. | Dominant, recessive |
| B. | Recessive, dominant |
| C. | Epistatic, hypostatic |
| D. | Hypostatic, Epistatic |
| Answer» D. Hypostatic, Epistatic | |