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== Diploid vs. haploid ==

Ploidy is the term used in genetics to describe the number of complete sets of chromosomes present in a cell. Organisms that reproduce sexually typically alternate between haploid and diploid states at different stages of their life cycles. A haploid cell contains a single set of chromosomes, denoted by the symbol "n." A diploid cell contains two full sets of chromosomes, one inherited from each parent, and is denoted by the symbol "2n."<ref>Alberts, B., Johnson, A., Lewis, J., Raff, M., Roberts, K., & Walter, P. (2002). ''Molecular Biology of the Cell'' (4th ed.). New York: Garland Science.</ref>

=== Comparison table ===

{| class="wikitable"
|-
! Feature !! Haploid !! Diploid
|-
| Symbol || n || 2n
|-
| Number of sets || One complete set || Two complete sets
|-
| Common cell types || Gametes (sperm and egg cells) || Somatic cells (skin, blood, muscle)
|-
| Production process || Meiosis || Mitosis
|-
| Human chromosome count || 23 || 46
|-
| Genetic composition || Genetic material is non-paired || Homologous pairs of chromosomes
|-
| Purpose || Sexual reproduction || Growth, development, and tissue repair
|}

[[File:Venn_Differences_between_Diploide-Haploide.png|thumb|center|800px|alt=Venn diagram for Differences between Diploide-Haploide|Venn diagram comparing Differences between Diploide-Haploide]]

=== Genomic structure ===

In diploid cells, chromosomes exist in homologous pairs. Each pair consists of one chromosome from the maternal contributor and one from the paternal contributor. These homologous chromosomes carry the same genes in the same locations, though they may possess different alleles. This configuration allows diploid organisms to carry recessive traits without expressing them, as a dominant allele on the corresponding chromosome can mask the effect of a recessive mutation.<ref>Campbell, N. A., & Reece, J. B. (2005). ''Biology'' (7th ed.). San Francisco: Pearson, Benjamin Cummings.</ref>

Haploid cells do not have pairs. Because they only carry one copy of each gene, any mutation present in the genome is expressed in the phenotype. This characteristic is frequently observed in the gametophyte stage of plants and in many species of fungi and algae.<ref>Griffiths, A. J., Miller, J. H., Suzuki, D. T., Lewontin, R. C., & Gelbart, W. M. (2000). ''An Introduction to Genetic Analysis'' (7th ed.). New York: W. H. Freeman.</ref>

=== Reproduction and life cycles ===

The transition between these two states occurs through the processes of meiosis and fertilization. Meiosis is a specialized type of cell division that reduces the chromosome number by half. This process converts a diploid germ cell into four haploid gametes. During meiosis, genetic recombination occurs, which creates new combinations of alleles on the chromosomes.

Fertilization reverses this reduction. When two haploid gametes fuse, their nuclei combine to form a single diploid cell called a zygote. This zygote then undergoes mitosis—a process where the cell replicates its DNA and divides into two identical diploid daughter cells—to facilitate the growth of a multicellular organism.

In some organisms, the majority of the life cycle is spent in the haploid state. This is known as a haplontic life cycle, common in many protozoa. In contrast, most animals follow a diplontic life cycle, where the haploid stage is limited to the single-celled gametes. Plants exhibit an alternation of generations, where both multicellular haploid forms (gametophytes) and multicellular diploid forms (sporophytes) occur in a single life cycle.

== References ==
<references />

[[Category:Comparisons]]

Differences between Diploide-Haploide - Revision history

Dwg: Article written and Venn diagram created.