At this point, draw a few Punnett squares on the white board; ask students to explain how and why we use them.
Ask for volunteers to fill in the Punnett squares for each of these crosses
This discussion leads us into today’s lab activity. Ask students if they can think of any other ways this would be helpful.
Today we are going to do a lab activity which will really tie all of this together
The group number indicates at which computer station the students will work.
Lesson 2 mendelian genetics & heredity lab
warm upUse letter “A” to represent fur color: If white fur is a recessive trait, what is the genotype of the white dog? If white fur is a dominant trait, what is the genotype of the white dog?
today’s schedule Pick-up daily notes/handout package Complete the warm-up: *The warm-up will be displayed on the smartboard as students enter. Discuss the warm-up. PowerPoint begins at this point: 5-Alive Recap: Lively 5 minute review/recap of previous lesson *if this goes over 5 min that is fine Introduce today’s topic and objectives (will be written in hand-out as well as on whiteboard) Group assignments (by me, pre-determined) Bean-otype lab activity: complete in small groups Discuss lab as class Homework will be independent practice on genotypes, phenotypes, & Punnett squares Turn in lab pages upon exiting
common coreMSDE (2012):INDICATOR3.3.2 The student will illustrate and explain how expressed traits are passed from parent to offspring.Assessment limits: phenotypes (expression of inherited characteristics) dominant and recessive traits sex-linked traits (X-linked only; recessive phenotypes are more often expressed in the male) genotypes (represented by heterozygous and homozygous pairs of alleles) Punnett square (use to predict and/or interpret the results of a genetic cross; translate genotypes into phenotypes - monohybrid only) pedigree (use to interpret patterns of inheritance within a family)
Punnett squares practice B=brown eyes, b=blue eyes1. Homozygous dominant mom and a heterozygous dad2. Heterozygous dominant mom and a heterozygous dad3. Recessive mom and a heterozygous dad R=red petals, r=brown petals1. Homozygous dominant and a heterozygous2. Heterozygous dominant and a heterozygous3. Recessive and a heterozygous
So what….. What if we are in the flower selling business and we want to determine how many red roses we are going to produce since the red roses sell for more money. What if your dog is having puppies and your want to determine what they may look like What if….
objectives By the end of today’s lesson, students will be able to discuss Mendelian genetics & heredity using scientific vocabulary with 85% accuracy by practicing it in small groups. By the end of today’s lesson students will understand how to create and use a Punnett square for monohybrid crosses with 90% accuracy. By the end of today’s lesson students will understand, with 85% accuracy, that the sorting and recombination of genes that occurs during fertilization leads to genetic variation among offspring by completing a lab activity. By the end of today’s lesson students will be able to predict offspring ratios with 75% accuracy by completing a lab activity.
group assignments Group 1: Andre, Irma Group 8: Scott, Willow Group 2: Nevia, Sam Group 9: Sophia, Josie Group 3: Juan, Tonya Group 10: Tarik, Simon Group 4: Lilli, William Group 11: Tammika, Kai Group 5: Anthony, Nu Group 12: Rudis, Suku Group 6: Malini, Miguel Group 13: Chris, Jacob Group 7: Quincey, Jane Group 14: Maria, Paula
Today’s lab activity To observe and understand the genetic variation among offspring we will complete an activity to simulate the sorting and recombination of genes that occurs during fertilization. http://betterlesson.com/unit/1114/070- genetics?from=profile#/document/9018/offspringratios
supplies 2 bags of beans Please have 1 group member pick up beans from lab supply table in back of room Lab sheets (found in your handout package) Pen or Pencil
beanotypes The beans represent the gene for fur color in rats. Black=B Black is dominant Red=b Red is recessive
methods To be completed collaboratively Work in small groups Discuss results as a class See the lab activity “Offspring, offspring, everywhere” for complete directions (in handout package)
results Each member of the group will fill in their own results table and write the answers to the results questions. We will discuss results as a class Labs will be turned in at the end of class
if you finish early… please review the vocabulary list from yesterday and quietly discuss the terms with your group member. Please discuss your lab results with your group member.
homework Worksheet: found in handout package http://yellowjacketscience.com/uploads/monohybrid_ crosses1.pdf
Exit ticket Today I will collect your labs instead of an exit ticket