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 a suitable explanation.
(B) No,the gametes formed from a parent organism do not have the same genetic composition because they do not contain identical copies of $DNA$.
During the pachytene and diplotene stages of meiosis-$I$,crossing over and chiasma formation occur between homologous chromosomes.
The exchange of $DNA$ segments between non-sister chromatids of homologous chromosomes occurs in a random manner,resulting in new combinations of $DNA$ sequences.
Furthermore,the independent assortment of chromosomes during meiosis-$I$ ensures that each gamete receives a unique combination of maternal and paternal chromosomes.
Consequently,after the completion of meiotic division,the resulting gametes possess $DNA$ with varying degrees of genetic variation.
During the pachytene and diplotene stages of meiosis-$I$,crossing over and chiasma formation occur between homologous chromosomes.
The exchange of $DNA$ segments between non-sister chromatids of homologous chromosomes occurs in a random manner,resulting in new combinations of $DNA$ sequences.
Furthermore,the independent assortment of chromosomes during meiosis-$I$ ensures that each gamete receives a unique combination of maternal and paternal chromosomes.
Consequently,after the completion of meiotic division,the resulting gametes possess $DNA$ with varying degrees of genetic variation.
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Similar Questions
Given below are four statements $(A - D)$ each with one or two blanks. Select the option which correctly fills up the blanks in two statements:
$A.$ The human male ejaculates about $(i)$ $200-300$ million sperms during a coitus. Out of which, for normal fertility at least $(ii)$ $60$ percent sperms must have normal shape and size.
$B.$ $A$ primary spermatocyte completes $(i)$ first meiotic division leading to the formation of two equal haploid cells called $(ii)$ secondary spermatocytes.
$C.$ Spermatogenesis starts at the age of $(i)$ puberty due to significant increase in the secretion of $(ii)$ $GnRH$, a hypothalamic hormone.
$D.$ Oogenesis is initiated during embryonic development and at puberty only $(i)$ $60,000-80,000$ primary follicles are left in each ovary.
$A.$ The human male ejaculates about $(i)$ $200-300$ million sperms during a coitus. Out of which, for normal fertility at least $(ii)$ $60$ percent sperms must have normal shape and size.
$B.$ $A$ primary spermatocyte completes $(i)$ first meiotic division leading to the formation of two equal haploid cells called $(ii)$ secondary spermatocytes.
$C.$ Spermatogenesis starts at the age of $(i)$ puberty due to significant increase in the secretion of $(ii)$ $GnRH$, a hypothalamic hormone.
$D.$ Oogenesis is initiated during embryonic development and at puberty only $(i)$ $60,000-80,000$ primary follicles are left in each ovary.
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