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18-Aug-2017 17:43

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.On the upper right, the male parent genotype is ZZ.The first Z is labeled to the right of the top quadrant, while the second Z is labeled outside the right quadrant.By the 1880s, scientists had established methods for staining chromosomes so that they could be easily visualized using a simple light microscope.With this staining method, scientists were able to observe cell division and to identify the steps that occurred during both mitosis and meiosis (Figure 1).

While using a light microscope to study sperm formation in wasps, Henking noticed that some wasp sperm cells had 12 chromosomes, while others had only 11 chromosomes.In humans, females inherit an X chromosome from each parent, whereas males always inherit their X chromosome from their mother and their Y chromosome from their father.



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