Q. No.How does sex determination in birds differ from that in humans?
| 1. | Birds have ZW females and ZZ males, while humans have XX females and XY males. |
| 2. | Birds have XX males and XY females. |
| 3. | Birds determine sex through environmental factors. |
| 4. | Birds have a single sex chromosome system. |
Subtopic: Sex Determination |
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Match the mechanism of sex determination with the corresponding organism:
1. A-ii, B-i, C-iii
2. A-i, B-ii, C-iii
3. A-iii, B-ii, C-i
4. A-i, B-iii, C-ii
| Column I | Column II | ||
| A. | XX-XY | i. | Birds |
| B. | ZZ-ZW | ii. | Drosophila |
| C. | Haplodiploidy | iii. | Honeybees |
1. A-ii, B-i, C-iii
2. A-i, B-ii, C-iii
3. A-iii, B-ii, C-i
4. A-i, B-iii, C-ii
Subtopic: Sex Determination |
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| Assertion(A): | Scientifically, it is correct to say that the sex of the baby is determined by the father and not by the mother. |
| Reason(R): | All ova produced by female have the sex chromosome X whereas in sperms Sex chromosomes could be either X or Y. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A) |
| 2. | Both (A) and (R) are true and (R) is not the correct explanation of(A) |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Sex Determination |
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In honey bees, sex is determined by:
1. Temperature-dependent mechanism
2. Number of Z chromosomes
3. Haplodiploidy mechanism
4. Presence of sex chromosomes
1. Temperature-dependent mechanism
2. Number of Z chromosomes
3. Haplodiploidy mechanism
4. Presence of sex chromosomes
Subtopic: Sex Determination |
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In the ZW sex-determination system found in birds:
| 1. | males are homogametic (ZZ) and females are heterogametic (ZW). |
| 2. | females are homogametic (XX) and males are heterogametic (XY). |
| 3. | sex is determined by environmental factors rather than chromosomes. |
| 4. | the Y chromosome determines maleness in birds, just like in mammals. |
Subtopic: Sex Determination |
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Which of the following combination of chromosome numbers represents the correct sex determination pattern in honey bees?
1. Male 32, Female 16
2. Male 16, Female 32
3. Male 31, Female 32
4. Female 32, Male 31
Subtopic: Sex Determination |
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Match List-I with List-II:
Choose the correct answer from the options given below:
1. A-II, B-IV, C-III, D-I
2. A-III, B-IV, C-I, D-II
3. A-IV, B-II, C-I, D-III
4. A-IV, B-I, C-II, D-III
| List-I [Mechanism of sex determination] |
List-II [Example] |
||
| A. | XX-XO; male heterogamety | I. | Birds |
| B. | ZZ-ZW; female heterogamety | II. | Honeybees |
| C. | Haplo-diploidy | III. | Drosophila |
| D. | Genic balance | IV. | Grasshopper |
1. A-II, B-IV, C-III, D-I
2. A-III, B-IV, C-I, D-II
3. A-IV, B-II, C-I, D-III
4. A-IV, B-I, C-II, D-III
Subtopic: Sex Determination |
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In honey bees, males (drones) are produced by:
1. Fertilised eggs and are diploid
2. Unfertilised eggs and are haploid
3. Fertilised eggs and are haploid
4. Unfertilised eggs and are diploid
1. Fertilised eggs and are diploid
2. Unfertilised eggs and are haploid
3. Fertilised eggs and are haploid
4. Unfertilised eggs and are diploid
Subtopic: Sex Determination |
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Level 1: 80%+
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Consider the given two statements:
| Statement I: | Haplodiploidy in honeybees determines sex based on the number of chromosome sets. |
| Statement II: | Male honeybees are haploid and develop from unfertilized eggs through parthenogenesis. |
| 1. | Statement I is correct; Statement II is correct |
| 2. | Statement I is correct; Statement II is incorrect |
| 3. | Statement I is incorrect; Statement II is correct |
| 4. | Statement I is incorrect; Statement II is incorrect |
Subtopic: Sex Determination |
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Level 1: 80%+
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| Assertion (A): | Male honeybees are haploid. |
| Reason (R): | Female honeybees are diploid. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A) |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A) |
| 3. | (A) is True, (R) is False |
| 4. | (A) is False, (R) is False |
Subtopic: Sex Determination |
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Level 1: 80%+
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