Lesson 3- Punnett Squares
Duration: 2 Days
Day 1
Hook: Introduce the concept of probability to students.
Image Citation: http://www.wscbrc.com/2 012/03/22/the-history-behind-flipping-a-coin/
Have students take a turn in tossing a penny and record the amount of times it lands on heads and tails after about 20 tries.
Body: Using a laptop and a projector, open the following link to a virtual lab on Punnett squares. Together with the class, go through the steps of developing a Punnett square with students and have them write along with you.
Body: Using a laptop and a projector, open the following link to a virtual lab on Punnett squares. Together with the class, go through the steps of developing a Punnett square with students and have them write along with you.
Image Citation: http://en.wikipedia.org/wiki/File:Punnett_Square.svg
Assessment: Using a sample question, show students how to implement the use of a Punnett square in determining probably offspring of a cross.
Provide them with an additional sample question to be completed on their own and submitted or taken up (time permitting) by the end of class.
Sample Question: Two heterozygous yellow seed plants (Yy) are crossed. Determine the genotype and
phenotype ratios of the F2 generation.
Homework: Provide students with additional problem samples which can be found in any textbook on Mendelian Genetics or you may wish to use an online resource. The link below provides examples of such for monohybrid crosses. Have students use Punnett Squares to answer the questions from this link where necessary.
Provide them with an additional sample question to be completed on their own and submitted or taken up (time permitting) by the end of class.
Sample Question: Two heterozygous yellow seed plants (Yy) are crossed. Determine the genotype and
phenotype ratios of the F2 generation.
Homework: Provide students with additional problem samples which can be found in any textbook on Mendelian Genetics or you may wish to use an online resource. The link below provides examples of such for monohybrid crosses. Have students use Punnett Squares to answer the questions from this link where necessary.