1. EQ: How are genes responsible for the variety of organisms that exist?
Mendel Genetics day 2
EQ: How are genes responsible for the variety of organisms that exist?

2. Punnett squares: Axes
Represent genotypes of each parent

3. Grid Boxes
Show all possible genotypes of offspring inside the grid box

4. Monohybrid Cross
Examines the inheritance of one specific trait

5. ratio
Genotype- Homo Dom : Hetero: Homo recessive
How many do you have of each genotype…
How many homozygous Dominant do we have?
How many heterozygous do we have?
How may homozygous recessive do we have?
1:2:1 for AA : Aa : aa 1 2 1

6. Phenotype ratio 3 1 Dom : Rec
If big A is dominant for red and little a is recessive for white…
How many red offspring are there?
How many white offspring are there?
Ratio?
3: Red: White 3 1

7. Dihybrid Cross Examines the inheritance of two traits at the same time
16 grid boxes
Skipp with standard! Or find beeter way to explain
- Do more practice with monohybrid cross

8. F.O.I.L

9. To find the four options for the top and sides, we need to use the foil method (First Outer Inner Last) to find the four alleles for each parent
Our two traits will be color and size
R is still dominant for Red and r is still recessive for white
T is now dominant for tall and t is recessive for short
Parent 1: RRTT
Parent 2: Rrtt
Add section to notes to practice F.O.I.L

10. F.O.I.L Parent 2: Rrtt RT RT RT RT Rt Rt rt rt Rt RT RT Rt RT rt RT rt
F irst
O uter
I nner
L ast
RT RT RT RT
Parent 2: Rrtt F O I L
Rt Rt rt rt Rt RT RT Rt RT rt RT rt

11. RT RT RT RT Rt rt Rt rt RRTt RRTt RRTt RRTt RrTt RrTt RrTt RrTt RRTt
ADDDDD to notes!!!!!! rt
RrTt
RrTt
RrTt
RrTt

12. Ratios: gento Genotype How many RRTt? How many RrTt? 8 : 8 RRTt : RrTt
Dom: rec
How many RRTt?
How many RrTt?
8 : 8 RRTt : RrTt

13. Ratios: phenotype 16 How many red and tall? How many red and small?
How many white and tall?
How many white and small?
Pheno: most Dom most rec

14. Law of Independent Assortment
Inheritance of one trait does not influence the inheritance of a second trait
Traits are inherited independently
Just because we are examining two traits at once doesn’t mean their inheritance is connected

15. Lets practice
Use the manipulatives to F.O.I.L. and complete the dihybrid cross on the table. You are working in pairs.
When finished and checked by Ms Beck, Start working on the practice example on the BACK of your notes!

16. Practice BR Br BR Br
BBRR
BBRr
BBrr
BbRR
BbRr
Bbrr BR Br bR br

17. Dihybrid cross Classwork
C – using level 2 voices
H- ask three before me (raise your hand to get my attention)
A- complete even # Mendel genetics review WS on table with markers provided (odd on own)
M- remain seated (butt on the stool)
P- work with your table partner
SUCCESS
Add how to determine parent genotypes from given offspring