So Sam has the disorder and one of his parents are likely the carrier since Sam is their son. That’s all I can provide since that’s all the info I was given.
Hair growth has three phases, The anagen, catagen and the telogen phases. Depending on where the hair is located, the anagen or the growth phase vary greatly. For the eyelashes it is only in this phase for about 30 days. Due to this, the eyelashes don't grow that much.
Ovulation is associated with fertility
Anyway, the term that describes the straightening of a joint is "extension".
Hope this helps you out in you HW :)