By Gareth Price
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Additional info for Biology: An Illustrated Guide to Science
In interphase, the DNA in the chromatin threads is dividing and multiplying to produce copies of all the genes in the cell—but this process is invisible. nuclear membrane centrioles centromere centromere attached to spindle equator chromatin thread Early anaphase Late anaphase spindle fiber Early telophase Mitosis Mitosis is a continuous process that involves four main stages. ● In prophase, chromatin is condensed into short, thick chromosomes. Each chromosome has duplicated and now consists of two sister chromatids visibly connected at their centromeres.
By telophase the chromosomes are at opposite ends of the cell, and a new nuclear membrane begins to form. It ends when the cell pinches in to produce daughter cells. © Diagram Visual Information Ltd. ● Uses of mitosis ● Mitosis produces daughter cells that are genetically identical to the parent cell. The growth and repair of multicellular organisms require mitosis to produce new cells. chromatids separate spindle fiber Late telophase Daughter cells centrioles replicate nuclear membrane reforms cytoplasm divides 51 Asexual reproduction: fission CONTINUITY Key words clone cyst fission mitosis pseudopodium Fission in amebas Fully grown ameba pseudopodia Two types of fission Fission is the splitting of a parent cell into a number of daughter cells.
The pollen tube that forms during pollen germination grows out of one of these pores. ● Pollen: internal structure The internal structure of a pollen grain is fairly simple. It is bounded by the intine, or inner wall, and contains two nuclei: the generative (sperm) nucleus and the tube nucleus. ● The tube nucleus controls the production of a pollen tube (see page 59). This structure grows out through a pore in the exine and passes between the cells of the stigma and style of the carpel. ● The generative nucleus passes down this tube toward the female nucleus found in the ovule.
Biology: An Illustrated Guide to Science by Gareth Price