Probability and Patterns of Inheritance—Lesson 4Mrs. Anna WardJames Martin MS

Do NOW!!!In Dogwood trees, white flowers (F) are dominant to pink flowers (f). In my yard, I have a pink Dogwood tree and a Three Hybrid (Ff) white Dogwood trees. If I were to cross my pink tree with one of my white trees….

1. Draw the Punnett Square.2. Tell me the Possible Genotypes.3. Calculate the Ratio & Percentage of Each

Genotype.4. Tell me the Possible Phenotypes.5. Calculate the Ratio & Percentage of Each

Phenotype.

Do Now Solution:1.

2. The possible genotypes are: Ff and ff3. The genotype ratio is 2:2 or 50% Ff, 50% ff4. The possible phenotypes are: White or Pink.5. The Phenotype ratio is 2:2 or 50% White, 50%

Pink

Ff ff

Ff ff

F f

f

f

•The Phen-o-type is what we SEE

•The Gen-o-type is in the GENES

Choral Response: Genotype/Phenotype

•HOMO-ZY-GOUS is the Same

•HETER-O is a different game

Choral Response: Homozygous & Heterozygous

•DOM-I-NANT will always win•But RE-CESS-IVE will show up now and then

Choral Response: Dominant and Recessive

Put it together•The Phen-o-type is what we SEE •The Gen-o-type is in the GENES•HOMO-ZY-GOUS is the Same•HETER-O is a diffe-rent game•DOM-I-NANT will always win•But RE-CESS-IVE will show up now and

then•Put it to-ge-ther and know you know•Mrs. Ward has taught all the in-fo

• BACKGROUND: A long time ago, in a galaxy far, far away, a great race of beings lived on a planet called ZORK. The inhabitants were known as Zorkonians. They are made up of 10 basic genes (unit) that code for their appearance. Each one of these genes is made up 2 alleles (traits). With this in mind, there are 1,024 different possible combinations for their appearance! This is called their phenotype or their physical appearance. If we look at their genes, there are 59,049 different combinations of the alleles! This is called the genotype or genetic makeup. Remember that we use letters for the alleles that control the genes and one letter or allele is inherited from each parent. You will be using Zorks, who use the same genetic principles as a pea plant, to see how genes are passed on and inherited. You will be using Punnett Squares to do this.

Zork Genetics

•1. Cross a heterozygous green skinned zork with a yellow skinned zork.

•A. What do the possible offspring look Like?

Problem 1

•2. Cross a homozygous two horned zork with a heterozygous two horned zork.

•A. What are the genotypes of the possible offspring?

Problem 2

•3. Cross a heterozygous green haired zork with a heterozygous green haired zork.

•A. What are the genotypes and phenotypes of the possible offspring?

Problem 3

•4. Cross a green lipped zork with a heterozygous purple lipped zork.

•A. What are the number of phenotypes and genotypes of the offspring? Hint: Count what is in the boxes!

Problem 4

•5. Tork, who is homozygous for tall meets Vorkina, who is short.

•A. What are the phenotypes and genotypes if they were to have offspring?

Problem 5

•Please work independently.

•Stay in your seat.

•Raise your hand if you have a question.

Problems 6-10