codominance

What if the heterozygous trait exhibited codominance?  in this case, two alleles can code for co-dominant traits.  That is, neither is dominant over the other.  Blood type is an example of this:

A is codominant to B
A is dominant over O
B is dominant over O

Possible genotypes:

heterozygous AB blood gives both type A protein and type  B protein on the erythrocytes.

homozygous AA gives blood type A  protein on the erythrocytes
homozygous BB is blood type B protein on the erythrocytes

Heterozygous AO is gives blood type A
Heterozygous BO is blood type B

 

An Introduction to Genetics

  Watch my introduction to Genetics video and make notes on it. You may use the notes organizer I provided in class called "The analogy of shoes"

Intro to Genetics ASSIGNMENT /40 marks 
Answer these questions on this worksheet  on A SEPARATE PAPER  in ink, or TYPED. ANSWER IN COMPLETE SENTENCES.  

In addition, write down your phenotype for the following characteristics 

Write down your phenotype for the following characteristics:

Earlobe attachment EE, or Ee.    unattached  ee

Tongue rolling TT or Tt              no tongue rolling tt

Cleft chin   CC or Cc                  no cleft cc

Widow’s peak WW or Ww.          straight hairline ww                    

Natural curl. NN.         straight hair nn.          wavy Nn       

Dimples DD or Dd            no dimples. dd

Righty RR   or Rr.          lefty rr

Freckles FF  or Ff           no freckles ff

internal ovaries  XX       internal testes XY