Genetics Unit Notes
I. What is Karyotyping?
A. Analyzing the chromosomes for ________________
B. usually involves blocking cells in mitosis and staining the condensed
chromosomes with Giemsa dye.
C. The bands don’t represent single genes, but in fact the thinnest bands
contain over a million base pairs and potentially hundreds of genes
D. For example, the size of one small band is about equal to the entire
genetic information for one bacterium
Individual A Individual B
What is the gender of the individual A? How do you know?
What is the gender of the individual B? How do you know?
For a quick review:
How many chromosomes do you get from dad? ______
How many chromosomes do you get from mom? _____
What are chromosome pairs #1-22 called? ________________
What is chromosome pair #23 called? ____________________
What kind of information can be discovered through a karyotype analysis?
Compare monosomy with trisomy? How could you tell them apart on a karyotype analysis?
In your own words, explain what happens in nondisjunction. (use the illustration to help you)
Are any abnormalities recognized in either karyotype to the left? Explain how you came to this conclusion.