Science - Lesson #2: Alleles

EOU Exam on Thursday, May 1st

Lesson #2:

Alleles

Dominant/Recessive and Homozygous/Heterozygous

Learning Intention:

Students will be able to explain how alleles are inherited from parents and determine traits, applying this knowledge to real-world genetics, including LULU and NANA, the CRISPR twins.

Success Criteria:

I can accurately define and distinguish between alleles, dominant and recessive traits, homozygous, and heterozygous.
I can explain how probability applies to genetic inheritance and use a coin flip activity to model the random assortment of alleles.
I can use a Punnett square to predict the probability of offspring inheriting a dominant or recessive trait (e.g., widow’s peak) from two parents.

Standards:

HS-LS3-3:

Apply concepts of statistics and probability to explain the variation and distribution of expressed traits in a population.

Reminders:

PTC Thursday Evening and Friday Afternoon

Part 1

Warm-Up

(5 min)

Directions: Tell the A.I. everything you know so far about DNA. This will determine whether we can move on to the next lesson.

SchoolAIAI-Powered Tutors and Learning Activities

Part 2:

Slow Reveal Graphs

(10 min)

Slow Reveal Graph - Alleles

Part 3:

Mini-Lesson / Stop n' Jot

(8 min)

Alleles are different versions of the same gene. They determine traits like eye color or having a widow's peak.

An allele can be dominant or recessive.

You inherit one allele from each parent.

A dominant allele is one that expresses its trait even if only one copy is present (e.g., brown eyes from the Bb or BB).

A recessive allele only expresses its trait when two copies are present (e.g.,Blue eyes from bb).

Part 4

Search and Unseen

Cengage Style

(10 min)

Directions:

Create four (4) annotations (text to self/previous lessons/life/movies - questions of the text and writing key concepts in own words)

Full Name:

Search Question

🔍 Based on Mendel’s observations, what is the difference between a genotype and a phenotype? Provide an example using dominant and recessive alleles.

Unseen Question

🧬 In a certain species of flowers, red petals (R) are dominant over white petals (r). A gardener notices that two red-flowering plants produced some offspring with white flowers. Explain how this is possible using your understanding of dominant and recessive alleles.

Part 5

Real-World Application

Imagine if Travis Kelce and Taylor Swift had a baby 🤮. Make a punnett square to determine the probability it has a widow's peak.

Widows Peak - Dominant (TT or Tt)

No Widow's Peak- Recessive (tt)

Possibility 1

Possibility 2

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