- 1(current)
Q. No.During his observation of spermatogenesis in a few insects, Henking found that a nuclear structure was received by 50 % of the sperms. He called this structure as:
| 1. | X – body | 2. | Y–body |
| 3. | X – chromosome | 4. | Y – chromosome |
Subtopic: Sex Determination | Sex Determination: Further Considerations |
82%
Level 1: 80%+
Hints
The mechanism of sex determination in grasshoppers is:
| 1. | XX – XY; male heterogamety |
| 2. | XX – XY; female heterogamety |
| 3. | XX – XO; male heterogamety |
| 4. | XX – XO; female heterogamety |
Subtopic: Sex Determination | Sex Determination: Further Considerations |
89%
Level 1: 80%+
Hints
In humans, the mechanism of sex determination is:
| 1. | XX – XY; male heterogamety |
| 2. | XX – XY; female heterogamety |
| 3. | XX – XO; male heterogamety |
| 4. | XX – XO; female heterogamety |
Subtopic: Sex Determination | Sex Determination: Further Considerations |
95%
Level 1: 80%+
Hints
In birds, the mechanism of sex determination is:
| 1. | XX – XY; male heterogamety |
| 2. | ZZ – ZW; female heterogamety |
| 3. | XX – XO; male heterogamety |
| 4. | ZZ – ZW; male heterogamety |
Subtopic: Sex Determination | Sex Determination: Further Considerations |
81%
Level 1: 80%+
Hints
A couple has a daughter. What is the probability that their next child will be a daughter?
| 1. | 0 % | 2. | 25 % |
| 3. | 50 % | 4. | 100 % |
Subtopic: Sex Determination | Sex Determination: Further Considerations |
91%
Level 1: 80%+
Hints
Consider the given two statements:
| Assertion (A): | Male honeybees do not have father and thus cannot have sons, but have a grandfather and can have grandsons. |
| Reason (R): | Male honeybees produce sperms by mitosis. |
| 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 but (R) is False |
| 4. | (A) is False but (R) is True |
Subtopic: Sex Determination: Further Considerations |
54%
Level 3: 35%-60%
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Hints
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Identify the incorrectly matched pair:
| Organism | Mechanism of sex determination | |
| 1. | Honey bees | Haplo-diploidy |
| 2. | Grasshoppers | XX-XO female heterogamety |
| 3. | Birds | ZZ-ZW female heterogamety |
| 4. | Fruit fly | Genic balance |
Subtopic: Sex Determination: Further Considerations |
67%
Level 2: 60%+
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Subtopic: Sex Determination | Sex Determination: Further Considerations |
74%
Level 2: 60%+
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The source of any of the genes located on either of the X chromosomes in a female cannot be:
| 1. | Her Mother's Father. | 2. | Her Father's Mother. |
| 3. | Her Mother's Mother. | 4. | Her Father's Father. |
Subtopic: Sex Determination: Further Considerations |
71%
Level 2: 60%+
Hints
- 1(current)
Q. No.
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