HOMOZYGOUS DOMINANT

	HOMOZYGOUS DOMINANT			HETEROZYGOUS			HOMOZYGOUS RECESSIVE
TRAIT	SYMBOL		LOOKS LIKE	SYMBOL	LOOKS LIKE		SYMBOL	LOOKS LIKE
Seed coat color	BB	Brown		Bb		Brown	bb		White
Height of plant	TT	Tall		Tt		Tall	tt		Short
Color of flower	CC	Red		Cc		Pink	cc		White

SIMPLE DOMINANCE

Bb x Bb

Genotypic ratio________________ Phenotypic ratio______________________

INCOMPLETE DOMINANCE

Cc x Cc

Genotypic ratio________________ Phenotypic ratio______________________

In the human disorder Sickle Cell Anemia, and individual homozygous (SS) for the trait will only produce red blood cells that are irregular in shape and unable to carry oxygen. An individual who is heterozygous (Ss) for the trait (also called a carrier) will produce some irregularly shaped cells, but will produce enough normal red blood cells to function normally. Cross two carriers of Sickle Cell Anemia.

What is the genotypic ratio ______________________ What is the phenotypic ratio ______________________

DIHYBRID

TtBb x TtBb

Phenotypic ratio______________________

TEST CROSS

Perform a test cross on a tall plant that may or may not be heterozygous? (T=tall, t=short)

MULTIPLE ALLELES

A type B woman who’s mother was type O blood, marries a man with AB blood. What genotypes and phenotypes are possible for their offspring?

SEX LINKED TRAITS

Complete the following cross: X^CX^c x X^cY

PEDIGREE ANALYSIS

Draw your own family pedigree. Include both sets of gradparents and all of your aunts, uncles and their kids. Assume that your Maternal grandfather (your moms dad…) has a recessive sex linked trait that makes him unable to say the word Aardvark. Follow the trait through your whole family by writing the genotype for each individual. Shade the shapes of all individuals who MIGHT NOT be able to say Aardvark.