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The cell cycle in eukaryotes: I = Interphase, M = Mitosis, G 0 = Gap 0, G 1 = Gap 1, G 2 = Gap 2, S = Synthesis, G 3 = Gap 3. Cell division is the process by which a parent cell divides into two daughter cells. [1] Cell division usually occurs as part of a larger cell cycle in which the cell grows and replicates its chromosome (s) before dividing.
Zoology (UK: / zuˈɒlədʒi / zoo-OL-ə-jee, US: / zoʊˈɒlədʒi / zoh-OL-ə-jee) [1] is the scientific study of animals. Its studies include the structure, embryology, classification, habits, and distribution of all animals, both living and extinct, and how they interact with their ecosystems. Zoology is one of the primary branches of biology.
Animal cells uniquely possess the cell junctions called tight junctions, gap junctions, and desmosomes. [26] With few exceptions—in particular, the sponges and placozoans—animal bodies are differentiated into tissues. [27] These include muscles, which enable locomotion, and nerve tissues, which transmit signals and coordinate the body.
Parasitism is a major aspect of evolutionary ecology; for example, almost all free-living animals are host to at least one species of parasite. Vertebrates, the best-studied group, are hosts to between 75,000 and 300,000 species of helminths and an uncounted number of parasitic microorganisms.
An interspecies friendship is a nonsexual bond that is formed between animals of different species. [1] Numerous cases of interspecies friendships among wild and domesticated animals have been reported and documented with photography and video. [1] Domestication of animals has led to interspecies friendships between species that would never ...
The biology of romantic love has been explored by such biological sciences as evolutionary psychology, evolutionary biology, anthropology and neuroscience. Specific chemical substances such as oxytocin and dopamine are studied in the context of their roles in producing human experiences, emotions and behaviors that are associated with romantic ...
Parthenogenesis can occur without meiosis through mitotic oogenesis. This is called apomictic parthenogenesis. Mature egg cells are produced by mitotic divisions, and these cells directly develop into embryos. In flowering plants, cells of the gametophyte can undergo this process.
Mitosis in the animal cell cycle (phases ordered counter-clockwise). Mitosis divides the chromosomes in a cell nucleus. Onion cells in different phases of the cell cycle enlarged 800 diameters. Mitosis (/ maɪˈtoʊsɪs /) is a part of the cell cycle in which replicated chromosomes are separated into two new nuclei.