Examples: The gene for seed shape in pea plants exists in two forms, one form or allele for round seed shape (R) and the other for wrinkled seed shape (r). A true-breeding round seed plant would be (RR) for that trait and a true-breeding wrinkled seed plant would be (rr).
Apart from that, the regulation of body temperature, preventing pathogens from entering the body, perspiration, generation of vitamin D, and protection from UV rays are some of the other functions of the integumentary system. Protection of the body from dehydration is also one of the important functions.
Functions of the Integumentary System. This is the skin, and skin derivatives; (hair, nails, glands and receptors). The Integumentary system has many functions: Protects the body's internal living tissues and organs; Protects against invasion by infectious organisms; Protects the body from dehydration; Protects the body against abrupt changes in temperature