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Gametogenesis is a biological process by which diploid or haploid precursor cells undergo cell division and differentiation to form mature haploid gametes.Depending on the biological life cycle of the organism, gametogenesis occurs by meiotic division of diploid gametocytes into various gametes, or by mitosis.
A gamete (/ ˈ ɡ æ m iː t /; from Ancient Greek γαμετή (gametḗ) 'wife', ultimately from Ancient Greek γάμος (gámos) 'marriage') is a haploid cell that fuses with another haploid cell during fertilization in organisms that reproduce sexually. [1] Gametes are an organism's reproductive cells, also referred to as sex cells. [2]
Alternation of generations is defined as the alternation of multicellular diploid and haploid forms in the organism's life cycle, regardless of whether these forms are free-living. [6] In some species, such as the alga Ulva lactuca , the diploid and haploid forms are indeed both free-living independent organisms, essentially identical in ...
The four gamete-test detects pairs of segregating sites that have arisen either by recombination or by a repeat mutation. The test is based on an infinite-sites assumption (i.e. repeat mutations have zero probability). Under this hypothesis, the probability of a repeat mutation is zero, and hence a recombination event is inferred.
Sexual reproduction is a type of reproduction that involves a complex life cycle in which a gamete (haploid reproductive cells, such as a sperm or egg cell) with a single set of chromosomes combines with another gamete to produce a zygote that develops into an organism composed of cells with two sets of chromosomes . [1]
Anisogamy is the form of sexual reproduction that involves the union or fusion of two gametes which differ in size and/or form. [12] The smaller gamete is considered to be male (a sperm cell), whereas the larger gamete is regarded as female (typically an egg cell, if non-motile).
In order to adjust to life in such drastically different environments, many changes occur in its cell biology, metabolism, gene expression and protein synthesis. Gametocytes of P. falciparum have been shown to exhibit a different pattern of gene expression than asexual stages, which is unsurprising if one were to consider the difference between ...
(Notice that k is replaced by • for the overall result—a common practice.) [9] The results for the example are p • = 0.631 and q • = 0.369 [black label "5" in the diagram]. These values are quite different to the starting ones (p g and q g) [white label "1"]. The sample allele frequencies also have variance as well as an average.
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