This is Gladys… awww, Gladys.

Here are some of her siblings!

Lil’ Darling

Larry

Jethro

Hoss

So what makes them so CUTE!?!?

Their PARENTS of COURSE!!!

Meet Dad, Rowdy…

Haircut?

…and Mom Sassy!!!

Slobber much?

Is it what you expected? Why not?

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Family Tree: Gladys the Golden-doodle

Gladys Larry JethroHossLil Dumping

Sassy Rowdy

Poodle (M)

Poodle (M)

F1 generation

F2 generation

P1Golden retriever(F)

Golden retriever(F)

Traits:

Traits = different physical characteristics

Heredity

Heredity = the passing of traits from parent to offspring

Genetics = the study of heredity

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Mendel guy sure loved his peas…

•Easy to study

• a lot of offspring

• looked at 7 traits

Give me an ALLELE!

Genes = the factors that control traits

Allele = different forms of a gene

MALE FEMALE

OFFSPRING

Part 1: Practice ProblemsHave your book open to page 83 Figure 3!!!

Are the following alleles DOMINANT or recessive

1. Round seed DOMINANT!

2. Wrinkled seed recessive…

3. Green seed DOMINANT!

4. Tall plant DOMINANT!

5. Short plant recessive…

Part 2: Labeling alleles

Scientists LOVE to use abbreviations!!! They will represent the allele with a letter. Uppercase for

DOMINANT and lowercase for recessive.

Example: Round seed = R and wrinkled seed = r

** always create a key and make sure to use letters that look different as lowercase

Key to alleles:

Trait Allele

Round seed R

Wrinkled seed r

Yellow seed Y

Green seed yTall T

Short t

Part 3:What will it look like?

DOMINANT + DOMINANT = DOMINANT

DOMINANT + recessive = DOMINANT

recessive + DOMINANT = DOMINANT

recessive + recessive = recessive

Try it now!

Alleles

What will it look like?

1.RR

2.Rr

3.rr

4.Yy

5.YY

6.yy

7.Tt

8.tt

Trait Allele

Round seed R

Wrinkled seed

r

Yellow seed Y

Green seed y

Tall T

Short t

Part 4: Super Challenge!

Trait Allele

Round seed R

Wrinkled seed

r

Yellow seed Y

Green seed y

Tall T

Short t

9. Rr Tt

10. rr YY Tt