Asian shovel teeth photo
Paul Swanson , Mr. Jonathan Dean. The critical role that breastfeeding plays in infant survival may have led, during the last ice age, to common genetic changes in East Asians and Native Americans that also affect the shape of their teeth. According to the researchers, this genetic mutation, which probably arose 20, years ago during a period referred to as the Beringian standstill, increases the branching density of mammary ducts in the breasts, potentially providing more fat and vitamin D to infants living in the far north, where the scarcity of ultraviolet radiation makes it difficult to produce vitamin D in the skin.
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Genetic Mutation Behind Shoveled Teeth May Have Been Key to Ancestral Survival
A Common Variation in EDAR Is a Genetic Determinant of Shovel-Shaped Incisors
It apparently has conferred some advantage to its carriers, because it is found in the majority of Asian people today. Or maybe those women survived when women with more body fat yes, boobs are fat, sorry guys and who could sweat less perished. Want to know if you carry this trait? Generally, a spreadsheet or Notepad will be your preferred methods.
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Shovel-shaped incisors a result of genetic mutation from last ice age
Native American mothers, such as this woman on Baffin Island in Canada, have a gene variant that may boost the nutrients in their breast milk. Living so far north with scant sunshine should have led to rickets and other health problems, yet somehow the population survived and even thrived enough to live there for thousands of years. The gene in question is known as EDAR. Native Americans and Asians carry a version of the gene that is linked to thicker hair shafts, more sweat glands, and shovel-shaped incisors.
The average adult human has 32 teeth—tiny chunks of smooth enamel, bloody pulp, yellow dentin and solid cementum. Beyond chomping, cutting and chatting, these pearly whites can reveal incredible secrets about our past. Just this year, teeth have helped scientists trace the path of early human migration, proved the continued existence of an indigenous people long believed extinct and even revealed the ancient roots of friendships between humans and dogs.
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