Friday, January 30, 2009

Friday 1/30

  • Notes on 7.2 - Incomplete and Co-dominance
  • Homework (except 1st period): Co-dominance of sickle cell if not completed
Monday: Mendelian Genetics Quiz, 6.3, 6.5, 6.6
  • Homework for Tuesday: Complete the di-hybrid crosses. 

Thursday, January 29, 2009

Thursday 1/29

  • Notes 6.6
  • Alleles and Punnett Squares Worksheet with a dihybrid cross
  • Homework: Read 7.1, 7.2

Wednesday, January 28, 2009


I just realized that your Onion Meiosis/Mitosis labs had not been marked "Family Access" only "Student Access".  I have fixed that and they now factor into the grade you were seeing.  They ALWAYS factor into the grades I see, therefore I did not realize this until someone brought it to my attention.  Your grade NOW should be absolutely final for Semester 1.

Wednesday 1/28

  • Notes: Finished 6.5
  • Punnett Square practice
  • Testcross worksheet
  • Homework: Testcross due Thursday!
  • No closing question

Tuesday, January 27, 2009

Tuesday 1/27

  • Notes on 6.5
  • Practice Doing Punnett Squares
  • Homework: Read 6.5, 6.6
Good job everyone who demonstrated Punnett Squares today!

Punnett Square:
  • Grid system for predicting all possible genotypes resulting from a cross.
    Axes: the possible gametesof each parent.
    Boxes: show thepossible genotypesof the offspring.

Monohybrid cross: involves one trait.(Mono=one, hybrid=combination)

  • Homozygous dominant x Homozygous recessive
    Offspring: all heterozygous, all dominant
  • Heterozygous x Heterozygous
    Genotypes: 1:2:1
    1 homozygous dominant: 2 heterozygous: 1 homozygous recessive
    Phenotypes: 3:1 dominant:recessive
  • Heterozygous x Homozygous Recessive:
    Genotypes: 1:1, heterozygous : homozygous recessive
    Phenotypes: 1:1, dominant : recessive

Dihybrid cross: two traits.

•Mendel’s dihybrid crosses with heterozygous plants yielded a 9:3:3:1 phenotypic ratio.

Monday 1/26

First day of the semester!!

  • Notes on 6.3
  • Mendel Activity
  • Homework: read 6.3, 6.4 (should be review)

Key Vocab:

•Test Cross
•Law of Segregation

Mendel made three key decisions in his experiments.
1. use of purebred plants
2. control over breeding
3. observation of seven“either-or” traits

Mendel's three conclusions:
-Traits are inherited as discrete units.
Laws of Segregation:
–Organisms inherit two copies of each gene, one from each parent.
–The two copies segregate (separate) during gamete formation.

Online Mendel Activity:
  • Go to
  • Find your book
  • “Animated Biology”
  • Unit 3
  • Chapter 6: Mendel’s Experiment

Tuesday, January 6, 2009

Tuesday Jan. 6, 2009


Today we took notes on 6.1. A copy of the powerpoint is available in the black binder in the back of the room.

This is a key introduction to chromosomes and MEIOSIS, the production of gametes (as apposed to MITOSIS, the production of gentically identical daughter cells).

Tomorrow we will dive into 6.2, which goes into the nitty gritty details of MEIOSIS. It serves you well to be able to compare and contrast (similarities AND differences) between meiosis and mitosis.

Sunday, January 4, 2009

January 5th


As promised, the next time we meet you will take the Ch. 5 quiz.  As of right now, this means on January 5th.

Hope you had an excellent break and see you all soon!