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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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 woman receives her X chromosomes from:
1. her mother only
2. her father only
3. both her mother and her father
4. extranuclear DNA in her mother's egg
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A woman has four daughters. The chance that her next child will be a son is:
1. | 1 | 2. | 0 |
3. | \(1 \over 2\) | 4. | \(1 \over 4\) |
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