Q11 of 13 Page 323

What role does sexual reproduction play in evolution?

In sexual proliferation gametes experience meiosis which presents variation by crossing over, fertilization of gametes additionally presents variation. Offsprings hereditary material differs from the parents and along these lines legacy of qualities in sexual generation presents variation in species.


More from this chapter

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9

On the basis of the possibilities of combination of the sex chromosomes, what percentage probability does a couple have of having a son or a daughter? Show the same by making a cross.

 10

‘Non-living material must have given rise to life’. Describe with an example.

 12

Explain with example how characteristics of a population changes over the years for the following situations-

(a) To gain survival advantage


(b) Due to accidental survival


(c) Temporary change of characteristics.

 13

While playing near a sugarcane field, Mohan noticed that the plants are almost similar to one another. At the same time, he noticed the mango trees in the next plot of land which are not similar to one another. Mohan’s brother told Mohan that sugarcane reproduces asexually, hence there is little variation, Mango reproduces sexually, and hence there is larger variation.

(a) Why sugarcane cannot reproduce sexually?


(b) Can mango reproduce asexually?


(c)If a person wants to have a flower garden, what type of plants should he grow?