Question

!!! Three Medal Question !!!

- Define cancer.

- What are chromosomes? When do they form?

- Identify the chromatids and the centromere of a chromosome.

Answer 1

1. The disease caused by an uncontrolled division of abnormal cells in a part of the body.
2.Chromosomes are thread-like structures located inside the nucleus of animal and plant cells. In living cells DNA is always associated with proteins and is organised to form chromatin strands and chromosomes.
3.A centromere is a region of DNA typically found near the middle of a chromosome.A centromere is a region on a chromosome that joins two sister chromatids.

Answer 2

A) Cancer is a term used for diseases in which abnormal cells divide without control and are able to invade other tissues.
http://www.cancer.gov/cancertopics/cancerlibrary/what-is-cancer
B) a thread-like structure of nucleic acids and protein found in the nucleus of most living cells, carrying genetic information in the form of genes. Chromosome form as DNA become coiled during prophase I.
http://wiki.answers.com/Q/When_do_chromosome_form?#slide=1

C)A centromere is a region of DNA typically found near the middle of a chromosome. A chromatid is one of the two identical copies of DNA making up a duplicated chromosome, which are joined at their centromeres, for the process of cell division. - See more at: http://www.chacha.com/question/can-you-identify-the-chromatids-and-the-centromere#sthash.5hiSVDLH.dpuf
Hope that helped!!