question_answer 9)

Higher organisms have resorted to sexual reproduction in spite of its complexity, why?

Answer:

Sexual reproduction is present in most of the organisms. Even the organisms which depend upon asexual reproduction for their multiplication, like algae and fungi, shift on to sexual mode of reproduction before the onset of adverse conditions. It is probable that gametes appeared from asexual spores under unfavourable conditions. Fusion of gametes had resulted in pooling of resources and combination of genetic potentialities of two. At the time of origin of sex benefits of this accidental fusion came to stay in life cycle. It is called as hunger theory of sex. These fusing gametes got specialized with evolution in higher organisms and gave rise to different types of heterogametes.