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Steps to solving Punnett Squares. Example # 1 In a certain species of mouse, pointed ears are dominant over round ears. Predict the genotypes and phenotypes.

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Presentation on theme: "Steps to solving Punnett Squares. Example # 1 In a certain species of mouse, pointed ears are dominant over round ears. Predict the genotypes and phenotypes."— Presentation transcript:

1 Steps to solving Punnett Squares

2 Example # 1 In a certain species of mouse, pointed ears are dominant over round ears. Predict the genotypes and phenotypes of a cross between two hybrid pointed-eared mice.

3 Write a key. Include both alleles. P= pointed ears p= round ears

4 Write a cross to show the parents genotypes. Parent one= Pp Parent two= Pp

5 Write the parents genotypes (letters) around the outside of the square. P p PpPp Parent One Parent Two

6 Fill in the square- copy letters down and across. P p PpPp Parent One Parent Two PP Pp pp

7 Write the percentage chance for the offsprings genotypes P p PpPp Parent One Parent Two PPPp pp 25%= PP (Homozygous Dominant) 50%= Pp (Heterozygous) 25%= pp (Homozygous Recessive)

8 Write the percentage chance for the offsprings phenotypes 75% chance of having Pointed Ears

9 Try it yourself In a certain species of dog, a black nose is dominant over a pink nose. Predict the genotypes and phenotypes of a cross between a purebred dominant male dog and a purebred recessive female.

10 Here are the Steps: 1. Write a key. Include both alleles. 2. Write a cross to show the parents genotypes. 3. Write the parents genotypes (letters) around the outside of the square. 4. Fill in the square- copy letters down and across. 5. Write the percentage chance for the offsprings genotypes 6. Write the percentage chance for the offsprings phenotypes


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