Life Cycles and Inherited Traits for Grade 3: Butterflies, Plants and Variation
Life cycles and inherited traits for Grade 3, with two concrete examples
Third graders learn life cycles best from something they can follow stage by stage. The Life Cycles and Inherited Traits unit compares life-cycle patterns, follows a butterfly and a flowering plant, and then moves to inherited similarities, variation and the effect of the environment.
See the unit and bundleIn short: Teach Grade 3 life cycles by comparing patterns across organisms, then following a butterfly and a flowering plant stage by stage. After that, move to inherited similarities, variation within a group and the ways the environment can influence traits. The Life Cycles and Inherited Traits unit covers this in eight lessons and closes with patterns, predictions and explaining with evidence. It is written with NGSS in mind, with no claim of approval or alignment.
Life cycles
Start with patterns across organisms
Lesson 1 of the Life Cycles and Inherited Traits unit compares the patterns in life cycles. Starting with the pattern rather than a single animal helps students see that organisms are born, grow, reproduce and die in ways that can be compared.
Ask students to sort cycle cards or draw a simple cycle for a familiar organism before they read the explanation page. The comparison is the skill the unit builds, and it returns in the later lessons.
Two examples
A butterfly and a flowering plant
Lesson 2 follows the stages of butterfly development and Lesson 3 follows the life cycle of a flowering plant. Having two concrete cycles lets students compare them directly: what is the same, what is different, and which stages have no match.
A practical tip is to keep a wall chart with two columns, one per organism, and add to it after each lesson. Students can point at the chart when they write the case card, and it gives you a quick visual check on who has the order of stages right.
Inheritance
Inherited similarities and variation
Lesson 4 looks at similarities passed from parents to offspring, and Lesson 5 describes differences among members of a group. Treat these as two halves of one idea: offspring resemble their parents, and yet no two individuals are identical.
Use plants, pets and other animals for examples. Keep students' own families out of it unless they volunteer, because some children will have complicated family situations and the science works just as well with a litter of kittens or a row of bean plants.
Inheritance, variation and environment are treated in three separate lessons, so none of them is rushed.
Environment
How the environment can affect traits
Lesson 6 looks at how the environment affects traits. It is a short step from variation, but it is a different idea: some differences are inherited, and some come from the conditions an organism grows in. A plant that grows in shade looks different from one grown in sunlight, and that difference is not passed on.
Ask students to sort a list of traits into "from parents" and "from the environment", then explain the hard ones. The disagreements are the useful part of the lesson.
Evidence
Patterns, predictions and explaining with evidence
Lesson 7 uses patterns to make predictions and Lesson 8 asks students to explain an idea with evidence. For Grade 3, a sentence frame works well: "I think ___ because I saw ___". Students can write it on the case card and you can read the cards quickly for understanding.
The unit also includes vocabulary pages, a learning check and a project with a record and reflection page. The project gives students a way to pull the life cycles and traits together into one piece of work.
Teacher support
What the guide and extras give you
The 13-page teacher guide contains a teaching concept, sequence and preparation notes, answers and teaching notes for all eight lessons, an assessment key with feedback, and a differentiation and observation chapter. The unit also includes editable DOCX text editions and a 17-slide presentation.
If you want to carry on into more science afterwards, the Elementary Science Bundle groups this unit with three others.
Plan
A suggested lesson-by-lesson pacing
The material gives no timings. This plan assumes one lesson per period, with the case card inside the period. Plan a longer window if you want to watch a real plant grow alongside Lesson 3.
| Lesson | Focus | Suggested pacing |
|---|---|---|
| 1 | Life-cycle patterns | 1 period |
| 2 | Butterfly development | 1 period |
| 3 | Flowering plants | 1 to 2 periods |
| 4 | Inherited similarities | 1 period |
| 5 | Variation within a group | 1 period |
| 6 | Environmental influences | 1 period |
| 7 | Patterns and predictions | 1 period |
| 8 | Explain with evidence | 1 period, then the learning check and project |
Resources
The unit, its bundle and related life science resources
The unit comes first, then the bundle that includes it, then a sibling unit and related life science resources.
Life Cycles and Inherited Traits | 8 Lessons, Case Cards & a Project | Grade 3
Elementary Science Bundle | Energy and Waves, Matter and Ecosystems, Life Cycles & Earth | 4 Units | Grades 3–5
Matter and Ecosystems | 8 Lessons, Case Cards & a Project | Grade 5
Elementary Life Science Bundle | Ecosystems, Pollination, Skeleton, Birds, Frogs & Plants | Grades 3–7
Frogs in the Ecosystem – Biology Lessons (Grades 5–7) | Life Cycles & Habitats
Elementary Science Curriculum | Life, Earth & Physical Science | 11 Units | Grades 3–5
What you get
What you can do this week
- Open with Lesson 1 and a card sort of life-cycle stages
- Start a two-column wall chart for the butterfly and the flowering plant
- Use the case card as a short written exit ticket after each lesson
- Teach the sentence frame "I think ___ because I saw ___" early
- Edit the DOCX text edition to match your class vocabulary
- Use the 17-slide presentation to introduce or review a lesson
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Questions
Frequently asked questions
Which standards does this unit fit?
It is written for Grade 3 science with NGSS in mind. No alignment or approval by any state, district or standards body is claimed, so compare the lessons with your own standards.
Are answers included?
Yes. The separate teacher guide has answers and teaching notes for all eight lessons, case guidance and an assessment key with feedback.
How long does the unit take?
The material gives no timings. Plan by lesson, usually one period each, and allow extra time for the learning check and project.
Can I edit the student pages?
Yes. The unit includes editable DOCX text editions of the classroom material and the teacher guide. The PDF is the print reference.
Is TeachLessons connected to a state or ministry?
No. TeachLessons is independent and is not endorsed by any department, ministry, state or exam board.
Who is the unit for?
Grade 3 science teachers who want a closed unit on life cycles and traits, and homeschool families who want printable lessons with a separate answer guide. In the UK and Australia it sits at roughly Year 4.
Four elementary science units in one bundle
The Elementary Science Bundle includes Life Cycles and Inherited Traits, Energy and Waves, Matter and Ecosystems, and a fourth unit on how Earth's surface changes. It costs $59.99 against $89.96 for the four separately.
See the science bundle