12/7-12/8 Scribe Post

12/7/10 Post

On Tuesday as we walked into class Mrs. Stein stamped our homework consisting of up 39-46. Then we discussed the homework and what everyone thought about it. Next we took some notes on pedigrees. The notes consisted of:

Pedigrees are used to trace disease through a family
Auto recessive disorders:
-Tay Sachs- degenerative nerve disease
-Death early in age
-Most common in Jewish population
Cystic Fibrosis- causes mucus build-up in the lungs, digestive system and liver problems
-Most effected in the northern European origins
Phenylketnuria (PKU)- lack of enzyme needed to break down phenylalanine, causes mental retardation
Autosomal Dominant Disorder:
-Huntington's disease- nervous system disease which causes loss of muscle function
Achondroplasia- a form of dwarfism
Codominant Disorders:
-Sickle cell disease
-Sickle cell anemia- abnormal shaped RBC's which do not carry oxygen effectively
Chromosomal Abnormalities and Non- Disjunctions:
-Non-disjunction in meiosis results in gametes with abnormal chromosomes number
-Most cases produce gametes that are not viable
Turner's Syndrome:
-Female with only one X chromosome
-Sterile
Klinefelter's Disease Syndrome:
-Male XXY, XXXY ,XXXXY
-Sterile

Taking notes and discussing the homework took up all of the class time on Tuesday.

Homework:
- up 53-56 (optional)
- up 47-52
- Quiz on Thursday

12/8/10 Post

In class today Mrs. Stein checked in our homework on pedigrees and genetic disorder problems which consisted of pages 45-52 in our unit packet. Then we went over the homework in our packets from both 12/7 and 12/8. Due to shortened periods we only had enough time to go over the homework and discuss what will be on the quiz tomorrow.

Homework:
-up 67-71
-up 53-56 (optional)
-Quiz tomorrow

The next scribe will be Alex Jackman.

this is my new room

Hello!!!!!!!!!!!

Hi.......
I figured a week would be just about enough time for people to start missing me!
i have been pretty good here and i an glad that i didn't wind up with a creepy roommate.
Just checking in!
Joel Kinzalow


P.S. look at the label!

?

i signed into the online book and it said there are "no products available" and that i should contact a teacher... HELP!

hey does anybody what we do for the Pearson activities?...i went to the website clicked unit 4 then 14.2 human genetic disorders and the "activities" button and nondisjunction disorders came up...is it suppose to be just reading??

Things may be more than they seem…

Today in Mrs. Stein’s biology class we learned about multiple alleles. Multiple alleles are a gene with two or more possible varieties. The most common example is the human blood types A, B, AB, and O. in theses blood types, types A and B are codominant, and type O is recessive.
A fun fact about blood types is that they are defined by what antigens are on the red blood cells.

We also talked about genetic disorders. There are three types of genetic disorders:
-Chromosome abnormalities- a mess up in the chromosomal order. A major example of this is Downs Syndrome.
-Single gene disorders-were a mutation is on only one gene
-Sex linked disorders- these are disorders in the chromosomes that determine the gender of an organism.

Here are some major facts about genetic disorders:
-they are a mutation in the DNA
-there are 22pairs of autosomes and 1 pair of sex chromosomes.
-many genetic disorders are autosomal and recessive

We then went on to talk about sex linked disorders; here are some facts about them:
-sex linked disorders are on the X chromosome only (in the sex pair there is either
XX-female or XY- male) and many are recessive.
-hemophilia, colorblindness, muscular dystrophy, and baldness are all examples of sex linked disorders.

In order of diseases to show in a woman she must have the disease on both Xs (XaXa), and only on the one x for men (YXa). So women can be carriers(XAXa), but men cannot.

We then quickly covered pedigrees before the bell rang. All pedigrees are, are what is used to trace a disease through family. And that’s when the bell rang ending class.

Here are some links to some videos if you need them:

This one explains a lot a bout how to use multiple alleles in a punnet squarehttp://www.youtube.com/watch?v=ROL5ekow-Y4




This one shows more on how a genetic disorder occurs and how it affects peoplehttp://www.youtube.com/watch?v=8s4he3wLgkM






This one shows some diferent types of genetic disordershttp://www.youtube.com/watch?v=eHQiwX5SSgM



The next scribe will be Michael D.

Sex Linked Problems

Below is how to do sex linked (aka X-linked) problems!