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This double-chromosome stage is called "diploid", while the single-chromosome stage is "haploid".Diploid organisms can, in turn, form haploid cells (gametes) that randomly contain one of each of the chromosome pairs, via meiosis.Multiplicity of gamete types within a species would still be considered a form of sexual reproduction.However, no third gamete is known in multicellular animals.Many species, particularly animals, have sexual specialization, and their populations are divided into male and female individuals.
Genetic traits are contained within the deoxyribonucleic acid (DNA) of chromosomes—by combining one of each type of chromosomes from each parent, an organism is formed containing a doubled set of chromosomes.The resulting cells are called gametes, and contain only half the genetic material of the parent cells.These gametes are the cells that are prepared for the sexual reproduction of the organism.Some of the many plausible theories include: that sex creates variation among offspring, sex helps in the spread of advantageous traits, that sex helps in the removal of disadvantageous traits, and that sex facilitates repair of germ-line DNA.
Sexual reproduction is a process specific to eukaryotes, organisms whose cells contain a nucleus and mitochondria.
As sexual reproduction developed by way of a long process of evolution, intermediates exist.