Subjective Type

Long Answer. 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.

Solution

Gamete formation happens after meiosis. During the Pachytene stage of Prophase I in meiosis, crossing over takes place. Crossing over is an important steps of meiotic cell division. Non-sister chromatids of homologous chromosomes exchange genetic material during crossing over. This leads to recombination of various genes.
Secondly, during Anaphase I of Prophase I, the maternal and paternal chromosomes undergo independent assortment.
Thus,the daughter cells produced after meiosis has a different genotype compared to the mother cell.
In the context of above facts about meiosis, it is clear that the gametes do not have the same genetic composition as the parental genome.


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