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No it isn't necessary that the parents should be of the same species. Mules (male donkey X female horse) have been found to be fertile (reference). The wikipedia page on hybrids lists many inter-species hybrids that are fertile including Beefalo (Domestic male cattle X american bison). There are also many canine hybrids which are fertile. Wholphins have been ...


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Both the male and the female would give half of the total number of chromosomes for their species (assuming both cells are normal). So if the organism has a total of 8 chromosomes, the mother and father would each give 4.


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Regarding option C: Although it is correct that testosterone is converted into DHT, it is the former, not the latter, which is responsible for differentiation of the mesonephric (a.k.a. Wolffian) ducts: Between 8 and 12 weeks, the initial secretion of testosterone stimulates mesonephric ducts to transform into a system of organs—the epididymis, vas ...


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This is a interesting question and for a long time it was thought that they do not age. In the meantime there are some new papers which say that bacteria do indeed age. Aging can be defined as the accumulation of non-genetic damages (for example oxidative damage to proteins) over time. If too much of these damages are accumulated, the cell will eventually ...


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The placenta does not turn "hostile" to the mother or fetus. Placentation abnormalities can result in harmful situations, but these are a secondary result. Structural anomalies of placentation: placenta accreta/percreta: means that the placenta took hold not only in the uterine mucosa, which is the normal state, but through it up to the myometrium (muscle ...


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An abnormal placenta position can lead to increased risk of heavy bleeding during placental delivery which further complicates the process by needing blood transfusion drugs. Anterior placental attachment is associated with increased risk of pregnancy induced hypertension , gestational diabetes mellitus due to dysfunction of lactogen hormone secreted by ...


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Simply put, no there is no treatment other than: watchful waiting hormonal treatment surgery A word of caution: undescended testes are subject to a much greater risk of testicular cancer if testes are undescended beyond 5 years of age (in humans). That is why the discovery of undescended testes in an adult will sometimes make orchidectomy advisable. ...



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