- 1(current)
Q. No.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 |
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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 |
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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 |
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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 |
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| A |  |
 |
| B |  |
 |
| 1. | Only A | 2. | Only B |
| 3. | Both A and B | 4. | Neither A nor B |
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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 % |
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It is unfortunate that in our society women are blamed for producing female children and have been ostracised and ill-treated because:
| 1. | The sex is determined by the type of sperm fertilizing the egg |
| 2. | The sex is determined by the type of egg fertilizing the sperm |
| 3. | The sex is determined by the hormones produced by the fetus |
| 4. | The sex is determined by God’s Will |
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| I. | The sex determination in honey bee is based on the number of sets of chromosomes an individual receives. |
| II. | An offspring formed from the union of a sperm and an egg develops as a female (queen or worker), and an unfertilised egg develops as a male (drone) by means of parthenogenesis. |
| III. | The males have double the number of chromosomes than that of a female, therefore, the females are haploid having 16 chromosomes and the males are diploid, i.e., having 32 chromosomes. |
| IV. | This is called a haplodiploid sex-determination system. |
| V. | The males produce sperms by mitosis, they do not have a father and thus cannot have sons, but have a grandfather and can have grandsons. |
| 1. | 2 | 2. | 3 |
| 3. | 4 | 4. | 5 |
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Q. No.
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