Thursday, November 11, 2010

November 10


Human Genetics

Today we reviewed meiosis for the quiz on Friday.

We did UP pg. 41 which measured the classes' different genetic traits such as tongue rolling, cleft chin, and Widow's peak.

We were also introduced to different terms on UP pg. 43-44.

Homozygous- two like genes for a given trait
ex. AA and aa

Heterozygous- has two different gene forms for a given trait.
ex. Aa

Phenotype- What a thing looks like
ex. What is the phenotype of a white cat? white.

Genotype- Genes that give the phenotype
ex. D (geno)= Dimples (pheno)

Complete Dominant Traits:

Dominant Gene- the gene that shows up in the heterozygous condition.

Recessive Gene- a gene that will give a phenotype only when in the homozygous condition.

Incomplete Dominant Traits- Neither gene is "hidden", both are expressed
ex. RR=red Rr=pink rr=white

Pure Breeding- organisms with genes only in the homozygous condition
ex. AA aa

Hybrids: (Aa, Gg)

Monohybrid- 1 trait
ex. Aa

Dihybrid- 2 traits
ex. AaBb

Trihybrid- 3 traits
ex. AaBbRR

This is where Punnet squares come in.

For Monohybrids, it is a 2 x 2 cross

For Dihybrids, it is a 4 x 4 cross

For Trihybrids, it is an 8 x 8 cross

- EC UP pg. 39-40
- Read Ch. 9 pg 142-168

Next scribe: Aliza


  1. I like how you reviewed everything in a basic way that makes it really easy to understand. This is a great review and the examples really help:)

  2. I like how you listed all of the general vocab so we don't forget the words from the beginning of the unit :)