Question : 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.

Question : Do all the gametes formed from a parent organism have the s

1.	Question : 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.
Answer» Solution :The gametes of a parent do not have the same genetic COMPOSITION as they do not have identical copies of DNA. During PACHYTENE and diplotene stages of MEIOSIS - I, the crossing over and chiasma formation take place between homologous chromosomes. The exchange of SEGMENTS of DNA from one chromatid to another (homologous chromosomes) occurs in a random manner, resulting in several new combinations of DNA sequances. Once the meiotic DIVISION is completed, gametes possess DNA with varying degree of variations.