PACT Due Dates

Adorina Moshava- Genetics

Easter Egg Genetics

Introduction:

 

In this activity you and a partner will be examining 4 Easter Eggs and solving Punnett squares to determine the genotype and phenotype of their offspring (Jellybeans or skittles). We will be looking at the color gene and how it is being passed down. Each side of the egg will represent a parent.
 
Standards:
CA- California K-12 Academic Content Standards
• Subject Science
• Grade Grade Seven
• Area Focus on Life Science
• Sub-Strand Genetics
• Concept 2A typical cell of any organism contains genetic instructions that specify its traits. Those traits may be modified by environmental influences. As a basis for under-standing this concept:
 Standard bStudents know sexual reproduction produces offspring that inherit half their genes from each parent.
 Standard cStudents know an inherited trait can be determined by one or more genes.
 Standard dStudents know plant and animal cells contain many thousands of different genes and typically have two copies of every gene. The two copies (or alleles) of the gene may or may not be identical, and one may be dominant in determining the phenotype while the other is recessive.
 
Students Prior Knowledge:
  • Heredity
  • Punnett square
  • Gene
  • Traits that are controlled by dominant and recessive alleles

 

Materials:
 
·        4 filled Easter eggs per group
 

Procedures:

1. Find a partner

2. Get four plastic eggs from your teacher. Do not squeeze the eggs. They will break!

3. Record phenotypes and genotypes of parent eggs using the key.

4. Use a Punnett square to determine the color of their offspring.

5. Write the phenotypes under the genotypes on the square.

6. Open the egg to check how accurate you were.

7. Switch the egg with another group and get 4 jellybeans each to eat.

8. Answer follow-up questions.

 

Data:

Easter Egg Color Key:

 

Blue = BB

Green= Bb

Yellow = bb

Purple = PP

Pink = pp

Orange = Pp

 

Egg #1:

a. Phenotype (color): ________________ X ____________________

b. Genotype: ________X __________

c. Punnett square:

 

Egg #2:

a. Phenotype (color): ________________ X ____________________

b. Genotype: ________X __________

c. Punnett square:

Egg #3:

a. Phenotype (color): ________________ X ____________________

b. Genotype: ________X __________

c. Punnett square:

 

Egg #4:

a. Phenotype (color): ________________ X ____________________

b. Genotype: ________X __________

c. Punnett square:

 

Follow-Up Questions:
 
1)      What does genotype mean?
 
2)      What does phenotype mean?
 
3)      What were the dominant colors of genes in this activity (The capital letters)?
 
4)      What were the recessive colors?
 
5)      Were your group’s jellybean genotypes and phenotypes correct for both your eggs? If not, where do you think might have gone wrong? (Make sure to check your Punnett squares!)
 
6)      What happened when a purple and a pink egg got together, in other words, what color were their offspring?
 
7)      How come purple (P) didn’t mask pink (p)? What color did you end up with instead? In genetics this is called incomplete dominance. Explain it.

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Norman Herr,
Apr 26, 2011, 8:09 PM
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