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April 11, 2017 Aims:

SWBAT interpret the genetic information contained in

pedigrees.

Agenda

1. Do Now

2. Class Notes/Check Yo’Self I

3. Class Notes/Check Yo’Self II

4. Independent Practice

5. Practicing our AIMS:

G.12-Pedigree Introduction

How will you help our class earn all of our S.T.R.I.V.E. Points?

UNIT TEST COUNTDOWN: Tuesday after Spring Break!

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Aim Check:

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OBJECTIVES: By the end of class, students will be able to…

SWBAT interpret the genetic information contained in pedigrees.

DO NOW

SCIENCE 8 Pedigree

Introduction

G.12

Name: _____________________________

Date: ________________________________

Homeroom: _________________________

Heredity

…aka why you’re the

cute one

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CLASS NOTES

PEDIGREE:

BULDING A PEDIGREE A pedigree for any family, be it dogs, cats or humans, shows the pattern of inheritance

in a family for a specific trait.

Males are shown as squares and females are shown as circles.

Each generation is assigned a _____________________, beginning with the

_________________ generation.

Individuals within generations are assigned numbers, beginning with the _____ __

and moving to the __ _____.

People who have children together are connected by a _____________________ line.

Their children are connected to them with a ______________ line.

Example: SIMPSON’S FAMILY TREE into SIMPSON’S PEDIGREE

= =

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CHECK YO’SELF!

1. Draw a pedigree that represents Mary married to Greg with 2 sons (Tyler and Shawn) and 1

daughter Madison. Their son Tyler married Carrie and had a son, Gary, and a daughter, Elizabeth.

Their daughter Madison married Harrison and had a son, Jon, and another son, Henry.

Please label the pedigree with the names of the people, generation, and Roman numeral.

2. Draw a pedigree that represents Julie married to Jeff, with one daughter, Josephine. Josephine

married Joseph and had 2 sons, Jason and Joe. Joe married Julia and had Jennifer and twin boys,

Jeffrey and Judson. Judson married Jenna and had Jasmine and Jonathon. Please label the

pedigree with the names of the people.

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CLASS NOTES

DISPLAYING HEREDITY

A shaded shape indicates the person

An empty shape indicates the person

Example:

Observe the pedigree. Number the generations and each person on the pedigree.

1. In this family, how many individuals show the trait?

2. Which males show the trait? (generation-number)

3. Does the pedigree show a dominant or recessive pattern of inheritance? How can you tell?

A half-filled shape indicates that the person is a

4. Can any of the people be considered carriers of the trait? If yes, color them in appropriately

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CHECK YO’SELF!

3. Observe the pedigree. Number the generations and each person on the pedigree.

In this family, how many individuals show the trait?

Does the pedigree show a dominant or recessive pattern of inheritance? How can you tell?

Can any of the people be considered carriers of the trait? If yes, color them in appropriately

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INDEPENDENT PRACTICE

1. The pedigree above shows a family’s pedigree for Hitchhiker’s Thumb. Is this trait dominant or

recessive? _______________________

2. How do you know? ____________________________________________________________

3. How are individuals III-1 and III-2 related? ________________________

4. Name the 2 individuals that have hitchhiker’s thumb ___________________

5. Name the 2 individuals that were carriers of hitchhiker’s thumb. ______________

6. Is it possible for individual IV-2 to be a carrier? ___________

Why? ________________________________________

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The ability to fly is a rare and wonderful trait. Flying is considered a recessive trait, while not being able

to fly is the dominate trait.

Once upon a time there was a man named Gomer who had the ability to fly. Gomer’s unique ability

attracted the attention of a beautiful young lady named Zoe. Zoe did not have the ability to fly, but she

was a carrier for the trait, which made her heterozygous.

In time Gomer and Zoe had four wonderful children. The first born was a tiny boy who, it turned out, was

afraid of heights. Lucky for Frank, he was not born with the ability to fly. But since Frank’s dad was a flyer

he was a carrier for the trait.

The second born, Billy, was also a son. Unlike his brother though, Billy could hardly keep his feet on the

ground. He loved to fly and hardly ever walked. Billy obviously inherited the recessive trait for flying.

Gomer and Zoe were very happy when their next child was a girl. Esmeralda, like her oldest brother, was

not a flyer. Although she often tried, she knew that it was a genetic trait and not something she could

ever learn. Like her oldest brother, she knew that she was a carrier for the trait and she often hoped that

she would someday have a child of her own that was a flyer.

The couple’s last child was a surprise. Just when they thought they were done having kids Zoe

discovered she was pregnant and gave birth to a beautiful red headed girl. With her bright red hair,

Scarlet looked like a fire flashing through the night sky when she flew.

All four of Gomer and Zoe’s children grew up happy and healthy. Even though she was the youngest,

Scarlet was the first to marry. On an evening flight to the local ice cream shop she met a strapping

young flyer by the name of Clark. She and Clark bonded over their love of flying and ice cream and

soon married. The couple had their first son, Kent, a short time later. Since both of them were flyers they

knew before Kent was born that he would have the ability to fly.

Frank, the oldest of Gomer and Zoe’s children was the next to marry. Given his fear of flying he was

careful to marry a girl who could not fly. He was in love and would have married her no matter what,

but was relieved when he met her family and realized that no one in the family could fly. This meant

that his soon-to-be wife was homozygous for not flying. The couple had two kids, a boy and a girl.

Neither could fly, but the boy was a carrier for the trait while the girl was not.

Complete the chart below and then use it as a guide to create a pedigree for the trait of flying.

Character Genotype Pedigree

Symbol

Character Genotype

Pedigree

Symbol

Gomer

Clark

Zoe

Kent

Frank

Frank’s Wife

Billy

Boy

Esmeralda

Girl

Scarlet

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Flying Pedigree

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Science 8

G.12

Pedigree Intro

Name: _____________________________

Date: _______________________________

Homeroom: _________________________

Quick Notes:

SKILL SNAPSHOT

Like A Scholar?

Yes No

Redo?

Yes No

1. Identify the number of generations are represented in the pedigree and explain how you know.

2. In generation I, which parent is a carrier for the trait? How do you know?

3. Which individual in generation II married a spouse who is homozygous dominant? Support your

reasoning using evidence from the pedigree.

4. Identify the generation in which the first case of sickle-cell anemia occurs. Use evidence from the

pedigree to support your reasoning.

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Debbie married Mike. They had 3 children, Paul, Becky, and Sean. Paul and Sean were both diagnosed

with muscular dystrophy.

Sean married Lindy and had 2 girls, Denise and Melissa.

Denise married Anthony. Of their 2 children, Maya and Devon, Maya was also diagnosed with muscular

dystrophy.

5. Draw a pedigree that represents the family described above. Label the pedigree with the names of

the people, generation, and Roman numeral.

6. In this family, how many individuals show the trait?

7. Does the pedigree show a dominant or recessive pattern of inheritance? How can you tell?

8. Can any of the people be considered carriers of the trait? If yes, color them in appropriately.