(a) Why it is said that sexual reproduction promotes diversity of characters in the offsprings?

(b) What are the barrier methods of birth control?

Asked by Topperlearning User | 21st Nov, 2013, 02:56: AM

Expert Answer:

(a) It is because sexual reproduction results from the fusion of two gametes coming from two different and sexually distinct individuals. This leads to variation which is necessary for evolution.  

(b) In barrier methods, physical devices such as condom, diaphragm and cervical caps are used. They prevent the entry of sperms in female genital tract during copulation. 

Answered by  | 21st Nov, 2013, 04:56: AM