frequency of allele = Square root (p^2)
= Square root (0.49)
= 0.7
Answer:
Stratum basale layer of epidermis produces melanin pigment.
Explanation:
The epidermis is composed of mainly four layers. In some areas like palm and foot, they contain five layers - stratum granulosum. All the layers are avascular i.e. lack of blood vessels.
The stratum basale cell is the deep layer of the epidermis. It is a single layer made of basal cells. The basal layer produces the keratinocytes. The keratinocytes divide mitotically and migrate to the upper layers. The keratinocytes provide hardness to the nail and skin, also make the skin waterproof.
Another two types of cells are present in the stratum basale - Merkel cell and melanocyte cell. Merkel cells provide sensory stimulation to the skin. Melanocyte cell produces pigment melanin.
Melanocyte gives color to skin, hair. It spreads from stratum basale to the upper layer of the skin called stratum corneum. Melanin pigment protects the skin from the ultraviolet radiation of the sun.
The punnet square gives the frequency with which each phenotype is observed. In this case, the possible outcomes are 9 + 3 + 3 + 1 = 16, 9 members will have one phenotype, three members will have a second phenotype, three members will have a third phenotype and 1 individual will have a fourth phenotype.
Facilitated diffusion or facilitated transport is also known as passive-mediated transport is the movement of molecules or ions across a biological membrane through transmembrane integral proteins. This process does not require chemical energy from ATP as such molecules and ions use the movement of gradient concentration for diffusion.
The lithosphere is different than the hydrosphere in that the lithosphere refers to the part of the Earth that consists of the rocks, the surface, the upper mantle and the depth of the plates; whereas, the hydrosphere, from the word hydro- which means "water", this comprises the 71% of the Earth's surface which is covered with water.
