4.由第五段的 However, what's more interesting is that the redhead DNA mutation is recessive, which means it is hidden and can often skip generations without showing 可知,这种特殊的DNA在携带者体内经常是隐形的。 5.由文章最后一段 This is why a person who does not have red hair can still ...
What does melanin do in the body?Melanocytes:The melanocytes are the cells that are responsible for the synthesis of melanin. The melanocytes are derived from the neural crest and found in the bottom or basal layer of the epidermis and hair follicles. Melanocytes are also found in the irises ...
It not only affected adult cows, but even the babies. The cows had double muscle tissue at birth, which means that they were literally born with twice as much muscle tissue as regular cows. The myostatin mutation also inhibited fat storage, so these cows were bred to produce extremely lean...
Melanin is produced in specialized cells called melanocytes, but these do not behave in the same way for all people. Some people naturally produce less melanin, which means less pigment and lighter skin. Other people possess fewer melanocytes than normal, which also results in less overall pigment...
a higher fraction of the genes in melanocytes that are responsible for melanin production is switched on. This means that a lot more melanin is produced per cell in darker-skinned people, not that darker-skinned people have more cells yielding the same level of output. This has important impli...
What is a virus and how does it work at the molecular level? What is an antibiotic and how do antibiotics work? Why don't antibiotics kill normal cells? What is a vitamin, and why do we need to take them every day? How do poisons work? What does it mean to be alive, at least ...
Blond or fair hair, also blonde, is a hair color characterized by low levels of the dark pigment eumelanin. The resultant visible hue depends on various factors, but always has some yellowish color. The color can be from the very pale blond to reddish "strawberry" blond or golden-brownish...
Passiflora, whose name means "passion flower", is a climbing plant native to America. It benefits the body by improving the recovery of the nervous system thanks to the sedative action of its flavonoids. Pavlova lutheri microalga Pavlova lutheri microalga Microscopic, single-cell organism rich in...
Which of the following cells does not have a nucleus? A) erythrocytes B) granulocytes C) leukocytes D) monocytes E) agranulocytes Why do cells appear to be white or colorless when you use indirect stains? What is the cell that produces the pigment melanin? Which of the following is an ex...
A symmetry means if a line is drawn through the middle of the mole, the 2 halves are not equal. B order means the edges of the mole are not smooth. C olors include blue, black, brown, or red. D iameter means the size of the mole is larger than a pencil eraser. E volution ...