profase

profase

1) The Þrst stage of mitosis during which chromosomes condense, the nuclear envelope disappears, and the centrioles divide and migrate to opposite ends of the cell. 2) The first stage of mitosis and meiosis (although in meiosis this phase is denoted with either a roman numeral I or II) where the chromatin condenses to form chromosomes, nucleolus dissolves, nuclear envelope dissolves, and the spindle begins to form.

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카테고리: 세포생물학
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profase I

고고학; 인간 진화

The first stage of meiosis. There are several stages of phophase I, including leptonema, zygonema, pachynema, diplonema, and diakinesis.

profase II

고고학; 인간 진화

The second stage of meiosis during which there is chromosome contraction.

núcleo del átomo

생물; 세포생물학

An atom's core; contains protons and one or more neutrons (except hydrogen, which has no neutrons).

número atómico

생물; 세포생물학

The number of protons in the nucleus of an atom.

asma

생물; 세포생물학

A respiratory disorder caused by allergies that constrict the bronchioles by inducing spasms in the muscles surrounding the lungs, by causing the bronchioles to swell, or by ...

ascomicetos

생물; 세포생물학

Division of fungi that contains the yeasts and morels; ascomycetes produce an ascus (or sac) in which ascospores are produced.

selección artificial

생물; 세포생물학

The process in which breeders choose the variants to be used to produce succeeding generations.

reproducción asexual

생물; 세포생물학

A method of reproduction in which genetically identical offspring are produced from a single parent; occurs by many mechanisms, including fission, budding, and fragmentation.

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Lago Hurón

The second largest of the Great Lakes of North America, bounded on the west by Michigan (U. S. ) and on the north and east by Ontario (Can. ). The ...