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.

Explanation

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.