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An orchidometer can measure testicular volume, which in turn is tightly associated with both sperm and hormonal parameters. [6] A physical exam of the scrotum can reveal a varicocele, but the impact of detecting and surgically correct a varicocele on sperm parameters or overall male fertility is debated. [6]
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These animals are usually sterile due to the different numbers of chromosomes between the two parents. The imbalance results in offspring that is viable but not fertile, as is the case with the mule. Sterility can also be caused by selective breeding, where a selected trait is closely linked to genes involved in sex determination or fertility.
In humans, barring intersex conditions causing aneuploidy and other unusual states, it is the male that is heterogametic, with XY sex chromosomes.. Haldane's rule is an observation about the early stage of speciation, formulated in 1922 by the British evolutionary biologist J. B. S. Haldane, that states that if — in a species hybrid — only one sex is inviable or sterile, that sex is more ...
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It is not very likely, but if it does happen there is a high risk of ectopic gestation. Statistics confirm that a handful of tubal sterilization surgeries are performed shortly after a vaginal delivery mostly by minilaparotomy. [1] In some cases, sterilization can be reversed but not all. It can vary by the type of sterilization performed. [1]
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