The 2nd lesson in a series of lessons on Mendelian Genetics for a 9th grade Biology course. This PP is the guide for our lesson.

1. Lab Activity
“Bean-otypes”

2. warm up
Use 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?

3. 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

4. common core
MSDE (2012):
INDICATOR
3.3.2 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)

5. 5-alive
Vocabulary review
 Gene
 Heterozygous
 Trait
 Allele
 Homozygous
 Genotype  Inherited trait
 Phenotype  Punnett square
 Dominant vs. Recessive  Pedigree

6. Punnett squares

7. Punnett squares practice
 B=brown eyes, b=blue eyes
1. Homozygous dominant mom and a heterozygous dad
2. Heterozygous dominant mom and a heterozygous dad
3. Recessive mom and a heterozygous dad
 R=red petals, r=brown petals
1. Homozygous dominant and a heterozygous
2. Heterozygous dominant and a heterozygous
3. Recessive and a heterozygous

8. 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….

9. 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.

10. 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

11. 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

12. 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

13. beanotypes 
 The beans represent the gene for fur color in rats.
 Black=B
Black is dominant
 Red=b
Red is recessive

14. 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)

15. 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

16. 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.

17. homework
 Worksheet: found in handout package
 http://yellowjacketscience.com/uploads/monohybrid_
crosses1.pdf

18. Exit ticket
 Today I will collect your labs instead of an exit ticket

19. references
 Vieira. (n.d.). Monohybrid crosses worksheet.
Retrieved from
http://yellowjacketscience.com/uploads/monohybrid_
crosses1.pdf