The MC1R gene gives directions for producing a protein known as the melanocortin 1 receptor. This receptor performs an essential function in normal pigmentation. The receptor is mainly situated on the melanocytes surface that are unique cells, which generate a pigment known as melanin.
Melanin is generated by the melanocytes located in the basal layer of the epidermis. The MC1R monitors the production of both pheomelanin and eumelanin.
The MC1R gene most prevalent among people of African ancestry produces eumelanin, a type of melanin. This melanin is responsible for their darker skin pigmentation, especially with UV exposure which stimulates melanocyte's production of more melanin.
The type of melanin produced by the version of the MC1R gene most prevalent among people of African ancestry is eumelanin. Melanin occurs in two forms: eumelanin which is black or brown and pheomelanin which provides a red color. People of African ancestry produce more melanin, specifically eumelanin, which provides a darker pigmentation. The MC1R gene plays an essential role in the synthesis of melanosomes, causing skin pigmentation.
For instance, when skin is exposed to the Ultraviolet (UV) rays from the sun, the UV rays stimulate keratinocytes to secrete chemicals which in turn stimulate melanocytes. The melanocytes increase the production of melanin which results in the darkening of the skin, also known as sun tan.
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El Niño
large asteroid and comet impacts
volcanic eruptions
global warming
Answer:one,two,four
Explanation:
Answer:
tsunamis Yeah
El Niñolarge Yeah
asteroid and comet impacts Nope
volcanic eruptions Yeah
global warming Nope
Explanation:
B. Organisms that reproduce asexually have offspring that are genetically identical to the parent offspring.
C. Genetic mutations can alter some of the traits of an organism, while others remain unchanged.
D. After a unicellular organism divides, each of the daughter cells is capable of living independently of the other.
Answer:
A.
Explanation:
It izz wat it izzzz!!!
:)
The primary role of endocrine system include :
It secretes chemical messengers called hormones directly into the blood stream.
These hormones control and regulate almost every bodily functions such as;
Endocrine system is a network of glands called endocrine glands that are present throughout the body.
To learn more about endocrine system :
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