chromosomes l.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
CHROMOSOMES PowerPoint Presentation
Download Presentation
CHROMOSOMES

Loading in 2 Seconds...

play fullscreen
1 / 12

CHROMOSOMES - PowerPoint PPT Presentation


  • 418 Views
  • Uploaded on

CHROMOSOMES What are chromosomes? Chromosomes are compact spools of DNA. Stretched out the DNA from one of your cells would be over 3 ft (1 m) long! Think of chromosomes as "DNA packages" that enable all the DNA to fit in the nucleus of each cell.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'CHROMOSOMES' - Antony


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
what are chromosomes
What are chromosomes?
  • Chromosomes are compact spools of DNA.
  • Stretched out the DNA from one of your cells would be over 3 ft (1 m) long!
  • Think of chromosomes as "DNA packages" that enable all the DNA to fit in the nucleus of each cell.
  • We have 46 of these packages in each cell; we received 23 from our mother and 23 from our father.
what do chromosomes look like
What do chromosomes look like?
  • Chromosomes are very small but when dyed can be seen with a microscope.
  • Chromosomes are best seen during mitosis (cell division), when they are completely condensed.
how do scientists read chromosomes
How Do Scientists Read Chromosomes?
  • Scientists use three key features to match up the 23 pairs:
  • Size: This is the easiest way to tell two different chromosomes apart.
  • Banding pattern: The size and location of the bands on chromosomes make each chromosome pair unique.
  • Centromere position: Centromeres are regions in chromosomes that appear as a constriction.
slide6
Chromosomes taken from dividing cells are attached to a slide and stained with a dye. This dye gives chromosomes a striped appearance because it stains the different regions of DNA.
how are chromosomes organized
How are chromosomes organized?
  • A karyotype is built by arranging the chromosomes in declining order of size.
why do scientists look at chromosomes
Why do scientists look at chromosomes?
  • Scientists can diagnose or predict genetic disorders by looking at chromosomes.