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Punnett Squares

genes <br>8th grade science

cocoore
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Punnett Squares

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  1. Punnett Squares Week 4 Outcome: I Can use a model to predict the inheritance of traits in mice.

  2. Using Punnett Squares Be sure to log into your Classlink before starting this lesson. Click the IMAGE to play the video

  3. Break it Down Completing a Punnett Square: • A punnett square consists of 4 squares, each representing a 25% probability for a total of 100% when added together. • One parent is placed at the top, on the outside of the punnett square. Use the genotype (allele combination). • The second parent is placed to the left on the outside of the punnett square. Use the genotype (allele combination). F f F f • The parents distribute their genes down (top parent) or across (side parent). f F f F • When finished, each box inside the punnett square will contain a gene from each parent.

  4. What you’ll need to get started Use the Student Exploration Sheet for directions on how to use the GIZMO. You’ll also complete various activities as you navigate through the GIZMO. (Note: The GIZMO and Student Exploration Sheet are hyperlinked - just click and go!) 1.GIZMO! Mouse Genetics (One Trait) Click HERE to access the GIZMO Breed "pure" mice with known genotypes that exhibit specific fur colors, and learn how traits are passed on via dominant and recessive genes. Mice can be stored in cages for future breeding, and the statistics of fur color are reported every time a pair of mice breed. Punnett squares can be used to predict results. Use the next slide to complete the Punnett Squares required for Activity C #1 & #3.

  5. 1. 3. Mouse Genetics: Activity C Directions: Complete the Punnett Squares from Activity C by clicking inEACH BLANK box and entering the correct genotype for each scenario. Parent 1: Heterozygous black (Ff) Parent 2: Heterozygous black (Ff) Parent 1: Heterozygous black (Ff) Parent 2: Homozygous white (ff)

  6. STsc: Explore 3: Using a Punnett Square Directions: Calculate the probability of each trait showing up from the information in the picture and answer the following questions:

  7. Tomas and Julie are about to have a child. Tomas has dark hair like his parents (DD). Julie also has dark hair, but her mother was blonde (Dd). How can we predict what color of hair their child might have? Use a Punnett square to predict the characteristics of the child. Consider the following scenario:

  8. RR X rr RR X Rr Rr X Rr Directions: Use the abbreviation R for round peas and r for wrinkled peas in the Punnett squares for each question. Work out the following crosses and answer the questions.

  9. rr X rr RR X RR Directions: Use the abbreviation R for round peas and r for wrinkled peas in the Punnett squares for each question. Work out the following crosses and answer the questions.

  10. Scenario 1: A man has genes of Pp. P will be dominant for purple, and p will be recessive for white. This means his hair is purple. A woman also has genes of Pp, and her hair is also purple. The pair decides to have children. Determine the hair color their children might show. Write a ratio showing the possible colors. Scenario 2: A man has genes of Pp, which means his hair color is purple. A woman has genes of pp, which means her hair color is white. They also decide to have children. Determine the hair color their children might show. Write a ratio showing the possible colors.

  11. Scenario 3: A man has genes of BB, which means his eye color is brown. A woman has genes of bb, which means her eye color is blue. They decide to have children. Determine the eye color their children might show. Write a ratio showing the possible colors. Scenario 4:A man has genes of bb, which means his eye color is blue. A woman has genes of Bb, which means her eye color is brown. They decide to have children. Determine the eye color their children might show. Write a ratio showing the possible colors.

  12. Analysis Questions:

  13. K W L Directions: Complete the “K” column of the KWL chart below about what you already know about incomplete dominance. Once you’re ready to move on, think about what you want to know “W” and complete this column. Finally, read the article linked in the image to the right. Once you’ve finished, return to this slide and complete the “L” or what you learned column.

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