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Cladogram- definition, features, parts, examples (vs Phylogram) A cladogram is the graphical representation of the hypothetical relationship (phylogenetic relationship) between different groups of organisms. It is used in the phylogenetic analysis of organisms to determine the evolutionary relationship between them. endocrine system | Definition, Organs, Function, Structure, Diagram ... endocrine system, any of the systems found in animals for the production of hormones, substances that regulate the functioning of the organism. Such a system may range, at its simplest, from the neurosecretory, involving one or more centres in the nervous system, to the complex array of glands found in the human endocrine system. Comparative endocrinologists investigate the evolution of ... Spermatogenesis- Definition, Stages and Process with figure Spermatogenesis. Spermatogenesis is the process of formation of mature sperm cells through a series of mitotic and meiotic divisions along with ...