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Also, during his observation of the stages of meiosis leading up to the formation of these sperm cells, Henking noticed that the mysterious twelfth chromosome looked and behaved differently than the other 11 chromosomes.Accordingly, he named the twelfth chromosome the "X element" to represent its unknown nature.The same is true of all other placental mammals — males produce X and Y gametes, and females produce only X gametes (Figure 4).In this system, referred to as the XX-XY system, maleness is determined by sperm cells that carry the Y chromosome.Interestingly, when Henking used a light microscope to study egg formation in female grasshoppers, he was unable to spot the X element.

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On the upper right, the male parent genotype is X-.In humans and many other animal species, sex is determined by specific chromosomes.How did researchers discover these so-called sex chromosomes?In fact, sex determination can be very different between different organisms.For example, in the XX-XO system found in crickets, grasshoppers, and some other insects, sperm cells that lack an X chromosome (referred to as O) determine maleness.




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