Tuesday, November 8, 2011

November 8th, 2011


Today in class we: (1) Finished some notes and (2) did the Karyotype Lab. (3) Homework

(1) We finished the "mistakes" notes. We briefly reviewed the last page, Breakage of a chromosome. Here are the notes we finished today if you missed them...

It is pretty straightforward, the only "side-note" we took on this page was on "Translocation"-- we said that "trans" means "change". So, that side-note can help understand what Translocation is: if a fragment changes location/reattaches to a non-homologous chromosome.

--What is a non-homologous chromosome?
First of all, a homologous chromosome is simply a pair of chromosomes which are similar in size, and each one is from mom and dad (thus, 2). In addition to, homologous chromosomes have genes that call for similar characteristics (i.e. eye color). A non-homologous chromosome is one that is not a pair of chromosomes, is not from mom and dad, and that do not call for similar characteristics.

(2) Next, we started the Karyotype Lab (pgs. 19-37). In class, we only did pg. 19-23 (using your cutouts). For homework, we have to finish the rest up to pg. 37*

--What are karyotypes?
Now that homologous chromosomes are explained, karyotypes are basically just the arrangement of homologous pairs. On the right is a picture of a Male karyotype. Although the two pairs don't look exactly the same in shape (some a twisted, for example, more than others), they are the same. This is kind of what the finished lab looked like.

So, in the karyotype lab we matched the different chromosomes that we cut out and taped them onto pg 23. The chromosomes in this lab were in metaphase because in it, the chromosomes are in "best length for identification".

(3) Homework:
Study for Quiz
Finish UP p. 19-37
(EC: UP p. 39-40)
Read CH 9 p. 142-168

*Depending on the letter she assigned you (A, B, C, D)-- NOT ALL OF THEM!



  1. Yvette-- I really liked how you included information about karyotypes with a chart of them. I also found it helpful that you posted the key points of the breakage of a chromosome--I needed that review one more time!! :)

    -- Emma

  2. Like Emma said (or wrote), your post was very helpful! I really like how you put the numbers, which corresponded with the "sections" below it. I also like how you put questions and answered them underneath. I wasn't positive about what a non-homologous chromosome was, but your explanation really helped! Good job!