Probability and Patterns of Inheritance—Lesson 4Mrs. Anna WardJames Martin MS

Do NOW!!!In Dogwood trees, white flowers (F) are dominant to pink flowers (f). In my yard, I have a pink Dogwood tree and a Three Hybrid (Ff) white Dogwood trees. If I were to cross my pink tree with one of my white trees….

1. Draw the Punnett Square.2. Tell me the Possible Genotypes.3. Calculate the Ratio & Percentage of Each

Genotype.4. Tell me the Possible Phenotypes.5. Calculate the Ratio & Percentage of Each

Phenotype.

Do Now Solution:1.

2. The possible genotypes are: Ff and ff3. The genotype ratio is 2:2 or 50% Ff, 50% ff4. The possible phenotypes are: White or Pink.5. The Phenotype ratio is 2:2 or 50% White, 50%

Pink

Ff ff

Ff ff

F f

f

f

Announcements

•I will collect Pre-Lab Sheets.

•Notebook Check next Thursday.

•Continue to work to earn Stamps.

Agenda:

•Quiz on Genetics

•Gummy Bear Lab

QUIZ: Punnett SquaresIn humans, brown eyes (B) are dominant to blue eyes (b).

1.What are the possible phenotypes for eye color as listed above?2.What would the be genotype of: a) a homozygous dominant human?b) A homozygous recessive human?c) A heterozygous human?

3.Which genotype(s) would code for brown eyes?4.Which genotype(s) would code for blue eyes?5.Draw a Punnett Square that crosses a homozygous dominant woman

with a heterozygous man.6.Calculate the Genotype Ratio.7.Calculate the Phenotype Ratio.8.Draw a Punnett Square that crosses a heterozygous female with a

homozygous recessive male.9.Calculate the Genotype Ratio.10.Calculate the Phenotype Ratio.

Pre-Lab Sheets

•If you did not complete it for homework, you may start now.

•Remain quiet and stay in your seat.•If you do not follow expectations you will

complete the alternate activity.

•Once you complete the sheet, you will be allowed to participate.

Gummy Bear Lab:

•Solution stations are posted on the Prep Room Door, TV, and on the end of the Cabinet by the Door.

•Stay in your area. Only one person from your team may get up to check the solution station. PICK UP DROPPED GUMMY BEARS IMMEDIATELY.

•You will be partnered based on the person sitting next to you. No complaints. Or else.

•Once I check your lab sheet, you and your partner may eat the Gummy Bears if so desired.

EXIT TICKET:

• If actual and predicted results sometimes vary, why do you think we even bother to study probability?