nuclear fission is the process that divides one nucleus into two genetically identical nuclei.
nuclear fission is the process that divides one nucleus into two genetically identical nuclei.
state the process that divides one nucleus into two genetically identical nuclei?
nuclear fission
in cell biology, mitosis () is a part of the cell cycle when replicated chromosomes are separated into two new nuclei. cell division gives rise to genetically identical cells in which the number of chromosomes is maintained. in general, mitosis (division of the nucleus) is preceded by the s stage of interphase (during which the dna is replicated) and is often accompanied or followed by cytokinesis, which divides the cytoplasm, organelles and cell membrane into two new cells containing roughly equal shares of these cellular components. mitosis and cytokinesis together define the mitotic (m) phase of an animal cell cycle—the division of the mother cell into two daughter cells genetically identical to each other.
mitosis
in nature, "p. digitatum" adopts a filamentous vegetative growth form, producing narrow, septate hyphae. the hyphal cells are haploid, although individual hyphal compartments may contain many genetically identical nuclei. during the reproductive stages of its life cycle, "p. digitatum" reproduces asexually via the production of asexual spores or conidia. conidia are borne on a stalk called a conidiophore that can emerge either from a piece of aerial hyphae or from a soil-embedded network of hyphae. the conidiophore is usually an asymmetrical, delicate structure with smooth, thin walls. sizes can range from 70–150 µm in length. during development, the conidiophore can branch into three rami to produce a terverticillate structure although biverticillate and other irregular structures are often observed. at the end of each rami, another set of branches called metulae are found. the number of metulae varies with their sizes ranging from 15–30 × 4–6 µm. at the distal end of each metula, conidium-bearing structures called phialides form. phialides can range in shape from flask-shaped to cylindrical and can be 10–20 µm long. the conidia produced, in turn, are smooth with a shape that can range from spherical to cylindrical although an oval shape is frequently seen. they are 6–15 µm long and are produced in chains, with the youngest at the base of each chain. each conidium is haploid and bears only one nucleus. sexual reproduction in "p. digitatum" has not been observed.
penicillium digitatum