Related Words

Embryo: Term applied to the zygote after the beginning of mitosis that produces a multicellular structure.

Embryonic Stem (ES) Cells: An embryonic cell that can replicate indefinitely, transform into other types of cells, and serve as a continuous source of new cells.

Embryo Sac: Alternate term applied to the angiosperm female gametophyte contained within a megaspore.

Zygote: A fertilized egg. Or the diploid cell that results from the joining of two haploid gametes (sperm and egg) during sexual reproduction, that will cleave to form an embryo. See also fertilizat . . . View Full Definition

Tumor: An abnormal mass of tissue. Tumors are a classic sign of inflammation, and can be benign or malignant (cancerous). There are dozens of different types of tumors. Their names usually reflect . . . View Full Definition

Pregnancy: The state of carrying a developing embryo or fetus within the female body. This condition can be indicated by positive results on an over-the-counter urine test, and confirmed through a bloo . . . View Full Definition

Rest: 1. Repose. Relaxation. 2. A fragment of embryonic tissue that has been retained after the period of embryonic development. Also called an embryonic rest.

Vascular Bundle: Groups of xylem, phloem and cambium cells in stems of plants descended from the procambium embryonic tissue layer.

Tube Nucleus: One of the cells in the male gametophyte in seed plants. The tube nucleus grows through the stigma, style, and into the ovule, clearing the way for the sperm nuclei to enter the embryo sac.

Umbilical Cord: The structure that connects the placenta and the embryo; contains the umbilical arteries and the umbilical vein.