What is a chromosome? 

In the core of every cell, the DNA particle is bundled into string-like structures that are called chromosomes that are made of DNA and protein. Every chromosome is comprised of DNA that is tightly closed. The way the chromosome is that DNA is coiled in many genes and is regulatory elements. While the other nucleotide sequence is in that is the histones that help its structure in the cell. Every human has a total of 46 chromosomes that are coming from the two parents 23 from the mother and 23 from the father.

Every chromosome has a narrowing point called the centromere, which partitions the chromosome into two is parts that are called arms. The first part is the short arm of the chromosome is named the p arm. The other arm is the long arm of the chromosome that is known as the q arm. The area of the centromere on the chromosomes gives the develops the look and structure.

Chromosomes are best seen at the point in cell division called the metaphase stage of mitosis. At this stage, the strands are condensed and aligned in one plane. But a chromosome can contain tens of thousands of genes, and the tiny details that make the difference between the DNA of two individual people are not visible through a microscope. There are X and Y chromosome X both representing the gender. The chromosome Y represents Male gender and the Y standing for Female. 

Reference

http://www.passmyexams.co.uk/GCSE/biology/what-are-chromosomes.html

https://ghr.nlm.nih.gov/chromosome

https://www.genome.gov/genetics-glossary/Chromosome

https://www.genome.gov/about-genomics/fact-sheets/Chromosomes-Fact-Sheet