Monday 18 September 2017

How Do Organisms Reproduce

How Do Organisms Reproduce

How Do Organisms Reproduce

Question 1. What is the importance of DNA copying in reproduction?
Answer: DNA copying in reproduction is important for maintenance of body designs and features. Moreover, DNA copying leads to variations. Variation is useful for the survival of species.
Question 2. Why is variation beneficial to the species but not necessarily for the individual?
Answer: Population of organisms reside in well-defined places or niches in the ecosystem. However, niches can change because of reasons beyond the control of the organisms, e.g., temperature changes, water level changes, etc. If population of reproducing organisms suited to particular niche and if the niche is drastically altered, the population can be wiped out. However, if some variations are present in a few inAividuals in these populations, there will be chances for their survival. The surviving individual can further reproduce and develop a population according to the changed niche, Thus, variation is beneficial to the species but not necessarily for the individual.
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Question 1. How does binary fission differ from multiple fission ?
Answer: When two new daughter cells are formed as a result of fission. It is called binary fission, e.g., Amoeba.When many daughter cells are formed as a result of fission, this is called multiple fission, e.g., Malarial parasite.

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