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Epistasis Lesson

Epistasis Lesson

Assessment

Presentation

•

Biology

•

10th - 12th Grade

•

Practice Problem

•

Hard

•
NGSS
HS-LS3-1, HS-LS3-2, HS-LS3-3

Standards-aligned

Created by

Brian Ackert

Used 8+ times

FREE Resource

21 Slides • 20 Questions

1

Epistasis Lesson

Slide image

2

Learning Targets

  • I can explain the difference between epistasis dominant and epistasis recessive.

  • I can identify the 'appearance' of epistasis genotypes.

  • I can use punnett squares to predict the ratio of crosses involving epistasis dom/rec.

3

Before you begin...

Please have notebook paper, blank 16 box page, green allele sheet available.

4


5

Multiple Choice

______ is the genetic occurrence in which two genes interact. One gene may 'suppress' another gene.

1

Epigenetics

2

Epistasis

3

Genomics

4

Trasnsmutations

6

Multiple Select

Based on the introduction...this video is going to focus on..

1

Labrador Retrievers Coloration

2

Squash Coloration

3

Gerbils Coloration

4

Hamster Coloration

5

Zucchini Coloration

7

I might add...

Epistasis can also be thought of how one gene can 'turn off' another gene. We will learn how an epistasis gene can turn off the coloration gene that may be present in labs and squash plants. This causes labs to look yellow or squash to be white colored fruits.

8


9

Multiple Choice

Based on the presentation SQUASH, the epistasis gene is _________.

1

Dominant

2

Recessive

10

Multiple Select

So...B = Coloration Masked (white), b = Coloration gene 'unmasked'. A = Yellow and a = green coloration. Which genotypes below would be WHITE in coloration?

1

aaBb

2

AaBB

3

aabb

4

AAbb

5

Aabb

11

Since the 'B' gene masks the yellow/green gene, then...

aaBb and AaBB would BOTH be WHITE squash plants. The "B" turns off the coloration gene.

12

Multiple Select

So...B = Coloration Masked (white), b = Coloration gene 'unmasked'. A = Yellow and a = green coloration. Which genotypes below would be YELLOW in coloration?

1

aaBb

2

aabb

3

AaBB

4

AAbb

5

Aabb

13

Multiple Select

So...B = Coloration Masked (white), b = Coloration gene 'unmasked'. A = Yellow and a = green coloration. Which genotype(s) below would be GREEN in coloration?

1

aaBb

2

aabb

3

AaBB

4

AAbb

5

Aabb

14


15

16

Slide image

17

Multiple Choice

Question image

What is the color of the two parents? bbAa x BbAa


B = masking

b = No masking


A = yellow

a = green

1

Yellow x White

2

Yellow x Yellow

3

White x Yellow

4

Yellow x green

5

green x yellow

18

Multiple Choice

Question image

What will be the ration of WHITE: YELLOW: GREEN offspring?

1

8 W: 6 Y: 2 G

2

8 W: 2 Y: 6 G

3

8 W: 4 Y: 4 G

4

6 W: 6Y: 4 G

5

Some other ratio

19

How Mr. Ackert worked this one!.

Here is my answer key to the previous. 8 White, 6 Yellow and 2 White

Slide image

20

Poll

Do you feel you understand the concept of Epistasis DOMINANT?

Yes, Iḿ ready to move on.

No, I need a bit of help.

21

If you need help...

Please ask Mr. Ackert before you move onto the next section. Thanks!

22


23

Please write these down:

E = Masking - OFF

e = Masking - ON (Yellow Coat)


B = Black coat

b = Chocolate Coat (brown)

24

Also know...the epistasis gene (ee) will NOT mask the nose and paw pad coloration.


25

Multiple Choice

A lab with the genotype of:


EeBb


would have a phenotype of...

1

Black fur / Black nose

2

Black fur / Chocolate nose

3

Yellow Fur / Black nose

4

Yellow Fur / Chocolate nose

5

Yellow fur / yellow nose

26

Multiple Choice

A lab with the genotype of:


eeBb


would have a phenotype of...

1

Black fur / Black nose

2

Black fur / Chocolate nose

3

Yellow Fur / Black nose

4

Yellow Fur / Chocolate nose

5

Yellow fur / yellow nose

27

Multiple Choice

A lab with the genotype of:


eebb


would have a phenotype of...

1

Black fur / Black nose

2

Black fur / Chocolate nose

3

Yellow Fur / Black nose

4

Yellow Fur / Chocolate nose

5

Yellow fur / yellow nose

28

Multiple Choice

A lab with the genotype of:


Eebb


would have a phenotype of...

1

Black fur / Black nose

2

Chocolate fur / Chocolate nose

3

Yellow Fur / Black nose

4

Yellow Fur / Chocolate nose

5

Yellow fur / yellow nose

29

Multiple Select

Which of these could be sold as a PUREBRED Labrador retrievers?

1

eebb

2

eeBB

3

EeBB

4

EEbb

5

eeBb

30

A dog MUST be homozygous for both epistasis AND coloration

EEBB, EEbb, eeBB, eebb

31


32

33

Slide image

34

Multiple Select

Question image

Which of these describe the two parents dogs of this cross?

1

Black Lab / Black Nose

2

Chocolate Lab / Chocolate Nose

3

Yellow Lab / Black Nose

4

Yellow Lab / Chocolate Nose

5

Both Dogs are yellow labs

35

Fill in the Blanks

Type answer...

36

Fill in the Blanks

Type answer...

37

Fill in the Blanks

Type answer...

38

Fill in the Blanks

Type answer...

39

Here is my completed Punnett square

Slide image

40

Poll

How well do you feel you now understand how to do the Epistasis recessive traits?

I understand.

I really don understand, but I am going to ask Mr. Ackert for help.

41

Please do a screen capture of your results following your completion of this video lesson.

Thanks! Mr. A

Epistasis Lesson

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