Answer:
I think you're referring to the Metaphase...
Explanation:
During Cell Division (or, rather before!) the DNA needs to be replicated. This normally is done by DNA Polymerase, and results in two identical double strands (the "Sister Chromatids".
These chromatids are held together at the Centromere, which will be the heart of the "X"-shape. After that the DNA is packed into Chromosomes by winding it around proteins called Histones. If I remember correctly there are 5 different Histones.
This "Zipping Up" makes the chromosomes more visible.
As the two sister chromatids are still connected, the result is the X-shaped Metaphase Chromosome....
Maybe if you show the question people could answer
Lumbar region refers to the lower back or lower spine.
important muscles of the lumbar spines are:
1) multifidus - stabilizes and rotates the lumbar spine
2) longissimus
3) spinalis
lower back pain are caused by improper posture, compression fracture, muscle injuries, fractured vertebrae, spinal stenosis, osteoarthritis, herniated disc.
The part of the fibula that is found near the Knee joint is the head
