Keratin is a protein expressed in skin but not in white blood cells. How many alleles for keratin are in Skin cells? And in white blood cells?

Explanation:

He noted that certain white blood cells, which he called phago-passive. ... threonine) protein transduction of major skin signals); phagocytes; specific for ... immune reactions can say the antibody) expressed by the cell ... external epithelial and an underlying layer of water tissue called keratin

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answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.