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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:
In some animals, the temperature at which fertilised eggs are kept determines whether the developing animal in egg is male or female.
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 a boy.
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VK GLOBAL PUBLICATION-HEREDITY AND EVOLUTION -SHORT ANSWER QUESTIONS - II
  1. What is DNA copying? State its importance.

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  2. "We cannot pass on to our progeny the experiences and qualifications e...

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

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  4. How do variations occur in an offspring?

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  5. Why is variation beneficial to the species but not necessary for the i...

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  6. What is speciation List four factors responsible for speciation.

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  7. List in tabular form, two distinguishing features between the acquired...

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

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

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  10. What are chromosomes? Explain how in sexually reproducing organisms th...

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  11. "Two areas of study namely 'evolution and classification are interlink...

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

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  13. Explain the following: (a) Speciation (b) Natural Selection

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  14. "Fossils are related to evolution", justify this statement. Give the t...

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  15. (i) Planaria, insects, octopus and vertebrates all have eyes. Can we g...

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  16. Mention three important features of fossils which help in the study of...

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  17. Explain analogous organs and homologous organs. Identify the analogous...

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  18. Describe the contribution of Lamarck.

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  19. Name the organism Mendel used for his experiments. Explain about F, an...

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  20. " It is possible that a trait is inherited but may not be expressed." ...

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