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Bottom: Same nucleus stained with DAPI and recorded with a CCD camera.
Chromosomes are so named because of their ability to take up staining.
Although the X chromosome could be stained just as well as the others, Henking was unsure whether it was a different class of object and consequently named it X element, The idea that the X chromosome was named after its similarity to the letter "X" is mistaken.
Both males and females retain one of their mother's X chromosomes, and females retain their second X chromosome from their father.
Since the father retains his X chromosome from his mother, a human female has one X chromosome from her paternal grandmother (father's side), and one X chromosome from her mother.
It is entirely coincidental that the Y chromosome, during mitosis, has two very short branches which can look merged under the microscope and appear as the descender of a Y-shape.
It was first suggested that the X chromosome was involved in sex determination by Clarence Erwin Mc Clung in 1901 after comparing his work on locusts with Henking's and others.
It was first noted that the X chromosome was special in 1890 by Hermann Henking in Leipzig.
Henking was studying the testicles of Pyrrhocoris and noticed that one chromosome did not take part in meiosis.
The number of possible ancestors on the X chromosome inheritance line at a given ancestral generation follows the Fibonacci sequence. "Growing the Family Tree: The Power of DNA in Reconstructing Family Relationships".).
The male's mother received one X chromosome from her mother (the son's maternal grandmother), and one from her father (the son's maternal grandfather), so two grandparents contributed to the male descendant's X chromosome ().
The X chromosome carries hundreds of genes but few, if any, of these have anything to do directly with sex determination.Tags: Adult Dating, affair dating, sex dating