Biology4s.com! This tutorial introduces cell structure. Other sections include plants, systems, invertebrates, vertebrates, and microorganisms.
Cells reproduce genetically identical copies of themselves by cycles of cell growth and division. The cell cycle diagram on the left shows that a …
Cell Division 1 . The mechanism of cell division; Mitosis and Meiosis. And Cell Cycle regulation . CELL DIVISION;. Cells of all organisms undergo cell division at one or the other stages of their development.
Suppose that the red chromosome shown in the diagram carries the gene for albinism, and the blue chromosome carries the gene for dark pigmentation.It is evident that the two gene alleles will undergo segregation at meiosis and that one-half of the gametes formed will contain the albino gene and the other half the pigmentation gene.
acquired trait: A phenotypic characteristic, acquired during growth and development, that is not genetically based and therefore cannot be passed on to the next generation (for example, the large muscles of a weightlifter).
Explore the stages of two types of cell division, mitosis and meiosis, and how these processes compare to one another.
Teaches all the phases of meiosis – both divisions – with terms and definitions that allow the student to identify the importance of each of these nuclear divisions
Plants have complex lifecycles involving alternation of generations.One generation, the sporophyte, gives rise to the next generation asexually via spores.Spores may be identical isospores or come in different sizes (microspores and megaspores), but strictly speaking, spores and sporophytes are neither male nor female because they do not
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The Visible Embryo is a visual guide through fetal development from fertilization through pregnancy to birth.