megaspore

megaspore

Four haploid cells produced by meiosis in the ovule of a þower. Usually, three of these cells degenerate, with the remaining cell becoming the female gametophyte phase of the plant's life cycle. Large (palynologists consider the megaspores to generally be above 200 micrometers in diameter) spores that develop into the megagametophyte, which in turn produces eggs.

0 0

Îmbunătăţire

Adăugare imagine

Parte de vorbire: substantiv
Sinonim(e):
Glosar:
Industrie/Domeniu: Biologie
Categorie: Biologie celulară
Company:
Produs:
Acronim-abreviere:

Mai mult

Adăugare la Glosarul Meu

Alte limbi:

Mai mult

Ce doriţi să spuneţi?

Vizualizaţi termeni similari

mezoderm

Biologie; Biologie celulară

The middle layer of cells in embryonic development; gives rise to muscles, bones, and structures associated with reproduction. The middle embryonic tissue layer. Cells and ...

melanin

Biologie; Biologie celulară

A pigment that gives the skin color and protects the underlying layers against damage by ultraviolet light; produced by melanocytes in the inner layer of the epidermis.

mejoza

Biologie; Biologie celulară

Cell division in which the chromosomes replicate, followed by two nuclear divisions. Each of the resulting gametes (in animals, spores in plants) receives a haploid set of ...

moždina

Biologie; Biologie celulară

1. A term referring to the central portion of certain organs; e. G. , the medulla oblongata of the brain and the adrenal medulla, which synthesizes epinephrine and norepinephrine. ...

makroevolucija

Biologie; Biologie celulară

The combination of events associated with the origin, diversification, extinction, and interactions of organisms which produced the species that currently inhabit the Earth. Large ...