Hey guys, sorry I didn't see this until today!!
Yesterday in class we went over the homework pages and learned how to analyze a pedigree chart. Here's what you need to know:
HOW TO DO A PEDIGREE CHART
Basic Key/General Ideas:
Squares represent males and circles represent females.
If it's unshaded it has a dominant trait, either TT or Tt. If its shaded it's recessive; tt.
If its half shaded and half unshaded, it represents a sex-linked chromosome.
Each of the lines represents something:
The horizontal lines between two are called "marriage lines". They show the marriages or parents or in-laws.
The vertical lines are "children lines".
You read the sibling lines from left to right in order of oldest to youngest.
ALSO it's a smart idea to label the rows. :)
The row is called the P1 Generation.
The next is the F1 Generation.
The next is the F2 Generation.
To solve this, start by marking everything that is shaded with two recessive genes (tt). Then go back and give everything blank ONE dominant gene. Then go back and try to solve as many as you can based on the clues.
Sometimes they can't be solved!!!
Today in class we had a shortened schedule because of Late Arrival. We took notes on the Chromosomal Theory of Inheritance and worked on homework.
CHROMOSOMAL THEORY OF INHERITANCE
Terms to know:
- Gene linkage- alleles that start out on the same chromosome and travel together during meiosis and fertilization. Ex: Red hair and freckles.
- Y Chromosome- 1/3 the size of X chromosome, male chromosome.
- Genes are located on chromosomes and the behavior during meiosis results in the inheritance patterns
- Gene linked alleles do NOT follow Mendel's principle of independent assortment.
- Y chromosomes are believed to have evolved from autosomes
- Passes from father to to son, can trace ancestry lines!
QUIZ TOMORROW! Good luck!
1. UP p. 73-77 & 81-88 due Monday
2. EC - UP p. 79-80 Due Friday
3. QUIZ Friday
4. TEST Tuesday
5. trihybrid due Monday
NEXT SCRIBE: MINJI