(meiosis)
101Espermatogénesis — Saltar a navegación, búsqueda La espermatogénesis es el mecanismo encargado de la producción de espermatozoides; es la gametogénesis en el hombre. Este proceso se desarrolla en los testículos. La espermatogénesis tiene una duración aproximada de… …
102fern — fernless, adj. fernlike, adj. /ferrn/, n. any seedless, nonflowering vascular plant of the class Filicinae, of tropical to temperate regions, characterized by true roots produced from a rhizome, triangular fronds that uncoil upward and have a… …
103Fern — /ferrn/, n. a female given name. * * * Any of about 10,000–12,000 species (division Filicophyta) of nonflowering vascular plants that have true roots, stems, and complex leaves and reproduce by spores. Though ferns were once classified with the… …
104reproductive system, plant — Introduction any of the systems, sexual or asexual, by which plants reproduce. In plants, as in animals, the end result of reproduction is the continuation of a given species, and the ability to reproduce is, therefore, rather conservative …
105Nondisjunction — Failure of paired chromosomes to disjoin (separate) during cell division so that both chromosomes go to one daughter cell and none to the other. Nondisjunction causes errors in chromosome number such as trisomy 21 (Down s syndrome) and monosomy X …
106prophase — The first stage of mitosis or meiosis, consisting of linear contraction and increase in thickness of the chromosomes (each composed of two chromatids) accompanied by migration of the two daughter centrioles and their asters toward the poles of… …
107Polyploid — This image shows haploid (single), diploid (double), triploid (triple), and tetraploid (quadruple) sets of chromosomes. Triploid and tetraploid chromosomes are examples of polyploidy. Polyploid is a term used to describe cells and organisms… …
108Mendelian inheritance — For a non technical introduction to the topic, see Introduction to genetics. Part of a series on Genetics Key components Chromosome DNA • RNA Genome Heredity …
109Reproduction — For other uses, see Reproduction (disambiguation). Production of new individuals along a leaf margin of the air plant, Kalanchoe pinnata. T …
110Germ line development — The cells that give rise to the gametes are often set aside during cleavage. During development, these cells will differientate into primordial germ cells, migrate to the location of the gonad, and form the germ line of the animal. Creation of… …
