REQUIRE more gestation period (should have been 21 months as compared to 9 months and will increase). Similarly the head size is increasing (especially the frontal brain) hence growth rate needs to increase but surprisingly most of the brain growth occurs after birth till 2 YEARS (when the arterior fontanellae CLOSE at 18 months) and some more till 30 years when FINALLY the cranial sutures close. Thus an increase in brain/skull size would required increase in gestation period.

"> REQUIRE more gestation period (should have been 21 months as compared to 9 months and will increase). Similarly the head size is increasing (especially the frontal brain) hence growth rate needs to increase but surprisingly most of the brain growth occurs after birth till 2 YEARS (when the arterior fontanellae CLOSE at 18 months) and some more till 30 years when FINALLY the cranial sutures close. Thus an increase in brain/skull size would required increase in gestation period.

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Assertion  : From evolutionary point of view, human gestation period is believed to be shortening. Reason : One major evolutionary trend in humans has been the larger head undergoing relatively faster growth rate in the foetal stage.[AIIMS 2004]

Biology The Living World / जीव जगत in Biology . 3 months ago

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As the humans would REQUIRE more gestation period (should have been 21 months as compared to 9 months and will increase). Similarly the head size is increasing (especially the frontal brain) hence growth rate needs to increase but surprisingly most of the brain growth occurs after birth till 2 YEARS (when the arterior fontanellae CLOSE at 18 months) and some more till 30 years when FINALLY the cranial sutures close. Thus an increase in brain/skull size would required increase in gestation period.

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Posted on 17 Aug 2024, this text provides information on Biology related to The Living World / जीव जगत in Biology. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.

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