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I believe that both websites are valid. First of all the sperm will get recycled and the materials recycled. But the semen doesn't do that. Excess semen builds up and then decays in the prostate, which can increase chances of getting prostate cancer. The only way to get rid of it is via ejaculation. While I am not sure on this subject my best guess is ...


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In organisms which have haploid males (such as honeybees), there is a variation of meiosis during spermatogenesis. The meiosis-I is abortive i.e. the chromosomal events such as crossover and separation of homologous chromosomes, do not happen. However, some cytological changes do happen which is described by Sharma et al (1961) as "simulation of the normal ...


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Organisms which grow from parthenogenesis (without fertilization) produce gametes by mitosis. Some examples are rotifers (bdelloid rotifers), crustaceans (water flea), honey bees, some birds (turkeys), etc. Parthenogenesis is a natural form of asexual reproduction in which growth and development of embryos occur without fertilization. In animals, ...


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The concepts are very similar but there are a few differences. Firstly, fitness is usually applied to alleles or genotypes, reproductive success to individuals. Secondly (and partially as a consequence of this), fitness is an average or idealised/expected property across a population; but actual reproductive success per individual is stochastic. ...



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