Genetic Crosses

Punnett Squares

EAGLE ZONEImagine you are going to one of those super trendy

restaurants with lots of dishes that you’ve never heard of. Tell me how many different combinations of an entrée and

dessert can be ordered at the restaurant. Use the menu below.

The Chez Punnett MenuEntrees

Bikini Island Shrimp Wild and Crazy Trout Sweet Potato Gratin with Baby

Pinecones Cornish Hen in Free Range

Chicken Wrapped in Organic Turkey, Smothered in Genetically Modified Plum Sauce

Turkey Cream Puff Pie

Desserts Chocolate Mink

103 Layers Chocolate Cake Ecuadorian Pomegranate

Popsicles Avocado Gelato

Watermelon Croissants

Mathbench.umd.edu/modules/prob-stat_punnett-squares_intro/page14.htm

Demystify the Punnett Square

How many different combinations could you order?

Super-Trendy Restaurant Chez Punnett

Creating combos at Chez Punnett1. Bikini Shrimp

2. Wild and Crazy Trout

3. Pinecone Gratin

4. Plum Hen 5. Turkey Puff

1. Chocolate Mink

2. 1000 Layer Cake

3. Pom Popsicle

4. Avocado Gelato

5. Watermelon Croissant

Explore 1Dragon Punnett Squares http://www.tcet.unt.edu/tegs/chapter2/fires.html Complete the Dragon Punnett Squares as we explore the

interactive game.

Explore 2Predicting Outcomes of One Trait CrossesMonohybrid Punnett Squares

Complete the 1st Punnett Square; we will check together as a class

Eagle Zone Complete the “Making Predictions” pages

we worked on yesterday during class You have 20 minutes to complete the pages

before we begin notes The notes page is on the back of the

“making predictions” handout

Bb X BbPhenotypic Ratio

3:1Genotypic Ratio

1:2:1 B b

B

b

B B B b

b B b b

The Story of Mendel

The Gene Idea

Explain

Mendel and Genetics Using your handout, answer the questions

as we explain the concepts surrounding basic genetic

Terms to Know

Character (heritable feature, i.e., fur color)

Trait (variant for a character, i.e., brown)

P generation (parents) F1 generation (first filial generation)

Punnett square: Gene:

point on a chromosome that controls the trait

Allele: an alternate form of a gene A or a

Homozygous: identical alleles for a character

Heterozygous (Hybrid): different alleles for a gene

Phenotype: physical traits

Genotype: genetic makeup

Terms to Know

It All Began with Mendel (FYI) Gregor Mendel was born in 1822. Called the “Father of Genetics” Late 1800 chromosomes and the process of

meiosis were unknown. Mendel’s work was considered obscure and

unimportant until 1900 Walter Sutton proposed the Chromosome

Theory and people began to listen to his ideas.

Chromosome Theory – specific genes are located on specific chromosomes

Three Conclusions to His Research1. Principle of Dominance

and RecessivenessOne allele in a pair may mask the

effect of the other

2. Principle of SegregationThe two alleles for a characteristic

separate during the formation of eggs and sperm

3. Principle of Independent AssortmentThe alleles for different

characteristics are distributed to reproductive cells independently.

Elaborate 1 More Monohybrid Crosses

Elaborate 2 Meiosis Competition

Dad Mom

WWHh X wwHH

Using your sock chromosomes, demonstrate how the possible gametes are formed and write the correct all the possible gametes that can be formed on the board.

Guided Dihybrid Cross

Parents: --- -WWHh ---X -- wwHH

Gametes:- WH--- wH

WH - -wH

Wh wH

Wh wH

What about 2 Traits?BbTt x BbTt

BT Bt bT bt

BT BBTT BBTt BbTT BbTt

Bt BBTt BBtt BbTt Bbtt

bT BbTT BbTt bbTT bbTt

bt BbTt Bbtt bbTt bbtt

Evaluate Wanted:

Big Headed Bugs with Long Wings

Breeding Options Using head size and wing color as the

two traits, predict the outcomes following bug crosses.

Bug 1 X Bug 5----HhWW X hhww

Bug 2 X Bug 4----hhww X hhWw

Bug 3 X Bug 1----HhWw X HhWW