how does the climatic condition of a place and genetic factors affect the changes during puberty of a person
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genetic :-
The height, weight or body-build of a child or an adult always represents the resultant of both the genetical and environmental forces, together with their interaction. It is a long way from the possession of certain genes to the acquisition of a height of 2m. gene depends for its expression firstly on the internal environment created by all the other genes, and secondly on the external environment.
The control of body size is certainly a complicated affair involving many genes, yet a disturbance in a single gene or group of genes may produce a widespread and drastic effect, as in the condition of achondroplasia, which is inherited as a simple dominant. On the other hand, the effects may be quite restricted and specific. The genetic control of dental maturation and eruption appears to be separate from that of skeletal maturation, and there is even evidence that the genes controlling the growth of different segments of the limbs are independent of each other.
Environmental :-
There is a well-marked seasonal effect on velocity of growth visible in most human growth data. Growth in height is on average fastest in spring and growth in weight fastest in autumn. This is true at all ages, including adolescence. The mechanism of the seasonal effect is not known; probably variations in hormone secretion are involved.
Climate seems to have a very minor effect on overall rate of growth in man. It has been suggested that each major race of mankind varies in stature according to the climates in which they live.
Seasonal variation in growth has also been observed in many studies. Longitudinal studies have shown that only about 30% of the children have cycles of increase and decrease in growth velocity which are strictly seasonal. The remaining children show accelerations and decelerations of growth which can not be clearly related with seasons .
i hope it will help you
regards
The height, weight or body-build of a child or an adult always represents the resultant of both the genetical and environmental forces, together with their interaction. It is a long way from the possession of certain genes to the acquisition of a height of 2m. gene depends for its expression firstly on the internal environment created by all the other genes, and secondly on the external environment.
The control of body size is certainly a complicated affair involving many genes, yet a disturbance in a single gene or group of genes may produce a widespread and drastic effect, as in the condition of achondroplasia, which is inherited as a simple dominant. On the other hand, the effects may be quite restricted and specific. The genetic control of dental maturation and eruption appears to be separate from that of skeletal maturation, and there is even evidence that the genes controlling the growth of different segments of the limbs are independent of each other.
Environmental :-
There is a well-marked seasonal effect on velocity of growth visible in most human growth data. Growth in height is on average fastest in spring and growth in weight fastest in autumn. This is true at all ages, including adolescence. The mechanism of the seasonal effect is not known; probably variations in hormone secretion are involved.
Climate seems to have a very minor effect on overall rate of growth in man. It has been suggested that each major race of mankind varies in stature according to the climates in which they live.
Seasonal variation in growth has also been observed in many studies. Longitudinal studies have shown that only about 30% of the children have cycles of increase and decrease in growth velocity which are strictly seasonal. The remaining children show accelerations and decelerations of growth which can not be clearly related with seasons .
i hope it will help you
regards
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