Study guide: Life Cycles and Traits
Compare organism stages and explain inherited and environmental differences.
Ideas to explain in your own words
- Many insects pass through egg, larva, pupa and adult stages. The stages have different structures and activities. Not every insect uses this four-stage life cycle.
- Germination begins growth from a seed. Flowering and pollination can lead to seed production. Reproduction creates a next generation rather than making an existing plant younger.
- Inherited information comes from parents. Environmental conditions can influence how a trait develops. Learning also changes behavior. Our fictional organism records identify the specific influence.
- Shared traits can suggest relatedness, but appearance alone is incomplete evidence. Individuals vary. A sample of three organisms does not establish the traits of an entire population.
Useful vocabulary
- egg
- early stage containing developing offspring
- germination
- seed begins growing
- inherited
- linked to parental biological information
- sample claim
- describes only observed individuals
Watch your reasoning
- Check what egg and larva each mean. They describe different clues.
- Check what germination and growth each mean. They describe different clues.
- Check what inherited and environmental each mean. They describe different clues.
A worked review example
Worked reference-card problem: a card states “early stage containing developing offspring”; a second states “feeding juvenile stage in this cycle.” The first fits egg and the second fits larva. The reason is the described function or change, not the order of the cards or a favorite name. If their descriptions exchange places, their category labels exchange too. Keep the supplied descriptions attached to the correct case. Worked reference-card problem: a card states “seed begins growing”; a second states “plant becomes larger.” The first fits germination and the second fits growth. The reason is the described function or change, not the order of the cards or a favorite name. If their descriptions exchange places, their category labels exchange too. Keep the supplied descriptions attached to the correct case. Worked reference-card problem: a card states “linked to parental biological information”; a second states “linked to supplied growing conditions.” The first fits inherited and the second fits environmental. The reason is the described function or change, not the order of the cards or a favorite name. If their descriptions exchange places, their category labels exchange too. Keep the supplied descriptions attached to the correct case. Worked reference-card problem: a card states “describes only observed individuals”; a second states “extends beyond supplied sample.” The first fits sample claim and the second fits population overclaim. The reason is the described function or change, not the order of the cards or a favorite name. If their descriptions exchange places, their category labels exchange too. Keep the supplied descriptions attached to the correct case.
Make a practice plan
- Use an example from Order complete metamorphosis. Say what happens and point to the clue that helps explain it.
- Complete Compare flowering-plant stages and correct the specific misconception in its feedback.
- Resolve a changed case from Separate trait influences, then combine the four ideas in the transfer task.