1. Heredity and Adaptation Teaching Slides, 2.3
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2. Larkey parents
Teacher master AA, Larkey Parents This is a pair of larkey parents What do you think their offspring might look like? We are going to set up a model to see what their offspring might look like and what the population could look like after two generations.
Heredity and Adaptation Course, 2.3: Heredity
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3. Focus question 2.3 Page 81
How can we model how genetic information passes from generation to generation?
Do not answer yet.
Heredity and Adaptation Course, 2.3: Heredity
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4. Larkey parent genes Teacher master AA, Larkey Parents
What do you notice about the genetic makeup of these larkeys?
They are homozygous for each trait, and each allele is represented.
Teacher master BB, Larkey Breeding Record
Heredity and Adaptation Course, 2.3: Heredity
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5. Breed the larkeys online
“A Model for Predicting Genetic Variation”
Follow the steps to guide students through the online activity.
Heredity and Adaptation Course, 2.3: Heredity
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6. 4. Breed the Larkeys
When we write a genotype, if a gene has a dominate and a recessive allele, we record the dominant allele first.
This is the first generation, and it is noted as F1.
The F stands for the Latin word filial meaning child.
The parents are the P generation.
Heredity and Adaptation Course, 2.3: Heredity

7. Share results Teacher master CC, Larkey Breeding Results
What did you notice about the larkey population?
There is a lot of difference between the parent’s generation, but the F1 generation all look the same. There are no long legs, stripes or spots, gray eyes, or bare tails.
What do you think will happen in the F2 generation?
Heredity and Adaptation Course, 2.3: Heredity
Steps 3-4

8. Share results Teacher master CC, Larkey Breeding Results
What do you think will happen in the F2 generation?
The long legs, stripes and spots, gray eyes, and bare tails will not spear in future generations.
These traits will occasionally show up in future generations.
Heredity and Adaptation Course, 2.3: Heredity
Steps 3-4

9. Breed the F1 generation
Turn to the Larkey Breeding Record you started in the last session. “A Model for Predicting Genetic Variation”
When students are done breeding the F1 generation, project teacher master CC, Larkey Breeding Results, that you started for this class. Tally the results.
Heredity and Adaptation Course, 2.3: Heredity
Steps 7-8

10. Study the larkey breeding results
How did the traits in the population change between the parent and the F1 generation?
How did the traits in the population change between the F1 and F2 generation?
Why did the F1 generation all look the same?
Why did all the F1 offspring have solid gray fur?
Heredity and Adaptation Course, 2.3: Heredity
Steps 8-9

11. 7. Breed F1 generation
They probably shouldn’t breed since they are brother and sister. Trade the Male with someone.
This is the immigrant male you see on the breeding record.
Fill in the genotype and phenotype for the immigrant male On the breeding record.
Now we can breed the next generation.
Heredity and Adaptation Course, 2.3: Heredity

12. 9. Study the traits
How did the traits in the population change between the parent and the F1 generation?
There were equal numbers of traits in the P generation except for solid gray fur. Five traits completely disappeared in the F1 generation, and one new one appeared.
How did the traits in the population change between F1 and F2 generation?
Traits that were absent in F1 generation reappeared in the F2 generation
Heredity and Adaptation Course, 2.3: Heredity

13. 9. Study the results Think about genotypes and phenotypes
Why did the F1 generation all look the same?
The F1 offspring inherited a dominant gene from one or the other of their parents so they all showed the dominant trait. They were all heterozygous for each trait.
Why did all the F1 offspring have solid gray fur?
They inherited one dominant and one recessive allele from their parents. Gray fur shows up when a larkey is heterozygous for fur color.
Is there any other observations you can make?
Heredity and Adaptation Course, 2.3: Heredity

14. Heredity and Adaptation Teaching Slides, 2.3 part 2
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Resources by Investigation provides access to all notebook masters, teacher masters, online activities, and video content:
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15. Response sheet Notebook sheet 9, Response Sheet—Investigation 2
Heredity and Adaptation Course, 2.3: Heredity
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16. Review vocabulary put it under your focus question (bottom of page)
Spend a few minutes reviewing the vocabulary for this part. Update the vocabulary index and table of contents in your notebook. Filial:
Heredity and Adaptation Course, 2.3: Heredity
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17. Answer the focus question 2.3 page 81
How can we model how genetic information passes from generation to generation?
Heredity and Adaptation Course, 2.3: Heredity
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18. Homework “Larkey Impossible Traits”
We’ll do the Practice mode in class; do the Quiz mode for homework.
Heredity and Adaptation Course, 2.3: Heredity
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19. Wrap-Up/Warm-Up
How was doing the Larkey Impossible Traits simulation like answering the response sheet?
Heredity and Adaptation Course, 2.3: Heredity
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Heredity and Adaptation Course, 2.3: Heredity