DURA	PISIFERA	TENERA
i.            Relatively thick shell       ii.            Thin layer of mesocarp     iii.            Thin layer of kernel	i.                    Absence of the shell ii.                  Thick layer of mesocarp iii.                Small kernel	i.                    Thickness shell ii.                  Thick layer of mesocarp iii.                Big kernel

Dura was a homozygous dominant with the presence of thick shell while Pisifera was a homozygous recessive with the absence of the shell. A ring of fibre called mesocarp surrounded the kernel. Therefore, Dura was cross pollinated with Pisifera to produce a heterozygous Tenera with an intermediate shell thickness surrounded by a ring of fibre in the mesocarp. Tenera palms became the standard planting material for all commercial purpose in 1958.