Sunday, November 21, 2010

Scribe Post 11/19/10

In class on Friday, November 19th, we finished up the Genetics note packet, which is chapter 9 in our Biology textbooks.

- occurs when ONE gene influences MANY physical traits

polygenic inheritance - when MANY genes effect ONE physical trait
-explains how parent can have offspring with different eye/skin color that they have

Genetics Disorder Crosses:

disorders include Achondroplasia (Dwarfism), Alzheimer's disease (mental disorder), Huntington's disease (mental disorder/uncontrollable movements), and Hypercholesterolemia (too much cholesterol in blood/heart disease). Requires at least one dominant allele to get these diseases. (Aa)

Recessive disorders include Albinism (white skin/hair/eyes), Cystic fibrosis (excessive mucus in lungs/liver, more vulnerable to infections), Sickle-cell disease (sickled red blood cells, damaged tissues), and Tay-Sachs disease (messed up brain cells). Requires 2 recessive alleles to get these diseases. (aa)

Types of Fetal Testing:
amniocentesis -
extracting SAMPLE of baby's amniotic fluid, baby's cells, and karyotypes to check baby's status

chorionic villus sampling (CVS) - sample of fetal tissue cells from woman's placenta (fetus feeder/cleaner)

ultrasound imaging - uses sound waves to produce an image of the fetus (doesn't harm the baby)

fetoscopy - a tube with a scope is inserted into the uterus for a direct view

family history, blood tests, genetic counseling~~~~~~~~~~~~~~~~~~~~~~~~~~~~~Potpourri (Pedigree Charts too) crosses

Chromosomal Theory of Inheritance -
genes are located on ch
romosomes; inheritance patterns are explained by the behavior of chromosomes during meiosis

Gene Linkage - alleles that are on the same chromosome travel together during meiosis and fertilization which means they're inherited together. They DO NOT follow Mendel's principle of independent assortment.

Y Chromosome - MANLINESS, 1/3 size of X chromosome, has 1/100 as many genes as X chromosome, not much crossing over, passes intact from father to son, can trace ancestry of males based on Y chromosome

Next Scribe: Claire


  1. I liked how you used different colors to highlight different words and show importance of the vocabulary words. Reading through the vocabulary words helped me refresh my brain over the weekend.
    Nice MEGA FONT! :)

  2. I like your pictures they helped me memorize the vocab for the test

  3. James thanks for adding some examples for the vocab like the cell really helped me understand the vocab better.

  4. James... I loved how you used so many different colors! It's a lot easier to understnad and I like how many pictures there were. Even the pictures were colorful! This will help me a lot! Thanks!