Q3 of 49 Page 7

Although sexual reproduction is a long drawn, energy-intensive complex form of reproduction, many groups of organisms in Kingdom Animalia and Plantae prefer this mode of reproduction. Give at least three reasons for this.

Sexual reproduction is the fusion of male and female gametes to produce genetically variant offspring. The sexual reproduction leads to:

1. Genetically varied offspring due to the recombination of the qualitatively different male and female DNA.


2. Due to recombination of DNA genetical variations are seen in the off springs.


3. This type of reproduction is useful as due to genetical variation the adaptation and survival compatibility increases.


More from this chapter

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1

Enumerate the differences between asexual and sexual reproduction. Describe the types of asexual reproduction exhibited by unicellular organisms.

 2

Do all the gametes formed from a parent organism have the same genetic composition (identical DNA copies of the parental genome)? Analyse the situation with the background of gametogenesis and provide or give suitable explanation.

 4

Differentiate between (a) oestrus and menstrual cycles; (b) ovipary and vivipary. Cite an example for each type.

 5

Rose plants produce large, attractive bisexual flowers but they seldom produce fruits. On the other hand a tomato plant produces plenty of fruits though they have small flowers. Analyse the reasons for failure of fruit formation in rose.

Both these plants - rose and tomato - both selected by human beings for different characteristics, the rose for its flower and tomato for its fruit. Roses, being vegetatively propagated do not need to produce seeds.