Important Vocabulary (check your vocab portion)

Allele: A variant of a gene (Ex: Blue eyes = b, Brown eyes =B)

Genotype: The allele combination contained in an organism's genome (Ex: Bb)

Phenotype: The physical observable trait expressed in the organism  (Ex: blue eyes observed)

Homozygous: When the allele combination is the same  (Ex: bb)

Heterozygous: When the allele combination is different  (Ex: Bb)

Dominant: When it takes over/is displayed; capital letter (B) 

Recessive: When it is overpowered/not displayed unless there are two present at once; lowercase letter (b)

Incomplete Dominance: A trait intermediate between the two parents. Appearance of a third phenotype.

Codominance: Two dominant alleles are expressed at the same time. Expression of both alleles.

1) What are the possible genotypes of offspring from a pairing.

2) What is the likelihood that a particular allele will be expressed in children.

a) Percentage chance for a genotype (50% Gg, 25% GG etc)

b) Percentage chance for a phenotype (75% chance of Green color).

​Objectives for using a Punnett Square:

​Now we will practice on the charts provided...

There are some charts on your table that you must practice. We will do four practice problems. You will also need to complete the three problems given to you on your handout..