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'Different species use different strateg...

'Different species use different strategies to determine sex of a newborn individual. It can be environmental cues or genetically determined.' Explain the statement by giving example for each strategy.

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Environmental Cue : (i) In some animals, the temperature at which fertilized eggs are kept determines whether the developing animal in egg is male or female.
(ii) In some animals like snail, individual can change sex.
Genetical Cue : A child who inherits an X-chromosome from the father will be a girl and one who inherits a Y-chromosome from the father will be boy.
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OSWAAL PUBLICATION-HEREDITY AND EVOLUTION-TOPIC - 1 (HEREDITY AND MENDEL.S CONTRIBUTION)(SHORT ANSWER TYPE QUESTIONS - II)
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  2. How do Mendel's experiments show that traits may be dominant or recess...

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  3. (i) Name the unit of inheritance. What is its function? (ii) How are...

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  4. Show inheritance of two characters over two generations by making a cr...

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  5. In a cross between plants with purple flowers and plants with white fl...

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  6. In one of his experiments with pea plants Mendel observed that when a ...

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  7. List three distinguishing features, in tabular form, between acquired ...

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  8. In a monohybrid cross between tall pea plants (TT) and short pea plant...

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  9. 'Different species use different strategies to determine sex of a newb...

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  10. What will happen if both the characters present in F(1) generation pas...

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  11. A pea plant with blue colour flower denoted by BB is cross-bred with a...

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  12. A cross was made between pure breeding pea plant one with round and g...

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  13. In one of his experiments with pea plants Mendel observed that when a ...

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  14. A cross was carricd out between a pure bred tall pea plant and a pure ...

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  15. A blue colour flower plant denoted by BB is crossbred with a white col...

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  16. (i) Differentiate between dominant and recessive traits. (ii) 'Gene ...

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  17. The genotype of green-stemmed tomato plants is denoted by GG and that ...

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  18. With the help of a cross done with garden pea plants, trace the work d...

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  19. In Mendel's monohybrid cross between tall and short pea plants, all of...

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  20. Explain with the help of a figure that father is responsible for the s...

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