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Are male sperm weaker than female sperm

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A spermatozoon is a male germ cell capable of fertilizing an oocyte and carries genetic information for determining the sex of the offspring. It comprises autosomes and an X X spermatozoa or a Y chromosome Y spermatozoa. The origin and maturation of both X and Y spermatozoa are the same, however, certain differences may exist. Previous studies proposed a substantial difference between X and Y spermatozoa, however, recent studies suggest negligible or no differences between these spermatozoa with respect to ratio, shape and size, motility and swimming pattern, strength, electric charge, pH, stress response, and aneuploidy. Moreover, recent proteomic and genomic studies have identified a set of proteins and genes that are differentially expressed between X and Y spermatozoa.
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Changing sperm speed can influence offspring’s sex, mouse study suggests

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Entrenched misinformation about X and Y sperm

Try out PMC Labs and tell us what you think. Learn More. E ditor —The widely held idea that spermatozoa bearing the Y chromosome Y sperm swim faster than those bearing the X chromosome X sperm seems to have originated from Shettles's work in , using phase-contrast microscopy. There were no intermediate types.
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Entrenched misinformation about X and Y sperm

Despite most parents ultimately just wishing for a healthy baby, there are many cultural and social factors that can drive the desire for a baby of a particular sex. The medical technology for sex selection of embryos has existed in Australia for many years, but such an option is only available for medical reasons, such as sex-linked chromosomal disorder. This leaves parents who do have a gender preference looking for natural ways of predetermining the sex of their baby.
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So goes a common belief, which asserts that sperm with Y chromosomes—those make male babies—swim faster, so you have a better chance of having a daughter if the sperm has to travel a long way to the egg. The idea has no scientific merit, but researchers have now found a way to make it true in mice, sort of. The scientists incubated mouse sperm in a mixture containing molecules that would bind to the receptors and activate them. The molecules slowed energy production in X-chromosome sperm while not affecting the Y-chromosome sperm at all, the team reports today in PLOS Biology. To confirm their findings, the researchers staged sperm races.
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