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Explain how, offspring and parents of or...

Explain how, offspring and parents of organisms reproducing sexually have the same number of chromosomes?

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Reduction division (meiosis ) during gamete formation halves the number of chromosomes in both male and female gametes. Since male and female gametes fuse during fertilisastion, the orginal number of chromosomes (as in the parent) is restored in the offspring
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LAKHMIR SINGH & MANJIT KAUR-HOW DO ORGANISMS REPRODUCE -SHORT ANSWER TYPE QUESTIONS
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  5. What are the three types of methods used for birrh control (or regulat...

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  6. (a) What is the name of surgical method of birth control in human male...

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  7. (a) Describe the surgical methods of birth control (i) for men, and (i...

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  8. (a) What is meant by contraceptive ? What are the different methods of...

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  9. (a) What are sexually transmitted diseases ? Give two examples of sexu...

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  10. (a) What substances are contained (i) in oral pills, and (ii) in vagin...

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  11. (a) What is the name of surgical method of birth control (or preventin...

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  12. Explain how, offspring and parents of organisms reproducing sexually h...

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  13. In tabacco plant, the male gametes have 24 chromosomes. (i) what is ...

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  14. (a) What would be the ratio of chromosomes number betweeen an egg and ...

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  15. (a) Fertilisation in humans can occur only once in a month. Why ? (b...

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  16. The diagram shows female reproductive system. Name the parts labelled ...

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  17. What is it advantage for the testes to be situated in the scrotal sac ...

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  18. Which structures in human female are equivalent to the following struc...

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  19. People who die from AIDS are not killed by the virus itself. Explain.

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  20. (a) What is the life support system of a fetus ? (b) How long does a...

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