Luke Hutchinson noticed that the inheritance patterns of these structures follows the Fibonacci sequence.
Luke Hutchinson noticed that the inheritance patterns of these structures follows the Fibonacci sequence. Lyonization inactivates these structures by wrapping them in a long, noncoding RNA called Xist. Abnormally long dendritic spines, macro-orchidism, and a narrow face with protruding ears characterize a defect in these structures, which is responsible for the majority of inherited cases of mental retardation. That disorder occurs when this structure is "fragile." Having an excess of these is known as Klinefelter's syndrome, and having too few of these characterizes Turner's syndrome. For 10 points, name this chromosome, two of which are found in biological females. 
Luke Hutchinson noticed that the inheritance patterns of these structures follows the Fibonacci sequence.
X chromosome