X-BIO-03 · GENETICS · 18 MIN

Reproduction and Heredity

Connect gametes to allele inheritance using a complete four-pairing model. Formative exploration.

Interactive investigation

YOUR MISSION

Does a 3:1 expected phenotype ratio guarantee the next four offspring?

Enumerate possible allele combinations for a one-locus cross.
Explain probability, dominance and the limitations of a simple inheritance model.

Before you begin

Describe a structure and its function. Change one variable at a time in a fair comparison.

Inspect the labelled model and its structure descriptions.
Record a prediction, choose the inputs and run a baseline.
Change one relevant input, predict again and run a comparison.
Compare the recorded outputs and explain a limit of this model.

EXPLORE IN THREE DIMENSIONS

From DNA to allele pairings

Simplified educational model

Rotate the original schematic, select a numbered part, then connect its structure to its role. Process markers illustrate the recorded experiment.

The system in three dimensions; sizes and distances are illustrative. Numbered labels match the structure list.

Phase 100%

Loading the 3D workspace…

Preparing original 3D geometry…

Enlarged schematic · Not to scale

Keyboard and touch controls

Drag to orbit. Pinch or use the zoom buttons to enlarge. Two-finger drag pans on touch devices; right-drag pans with a mouse. Focus the 3D view and use arrow keys to rotate, +/− to zoom, Shift + arrow keys to pan, and Home to reset the camera. Every selectable structure is also a button below.

Visible layersBiological structures

Structure explorer Also works without 3D

Look closer.

Select a structure in the model or the list to connect its position, shape and function.

The system in three dimensions; sizes and distances are illustrative.

Follow a guided exploration

Move through the structures in an order that connects their roles.

Model assumptions and limitations

DNA, chromosome and offspring pairings are shown at unrelated scales. Abstract A/a alleles model complete dominance only.

This is a spatial learning model. Colour, transparency and layer separation help reveal relationships; they are not measurements.

PROCESS PLAYBACK

Run a predicted experiment to activate process playback.

1Predict
2Set inputs
3Run
4Compare

CHANGE A CONDITION

Predict. Then find out.

0 / 12 recent trials

Parent 1 allelesAaParent 2 allelesAa

Your prediction What will change, and why? Name a condition you will hold constant.

Add a prediction of at least 8 characters.

Connect the observation to biology.

Alleles are variants at a gene locus; offspring receive an allele from each parent in this model.

Expected proportions describe probabilities; small families need not match those proportions.

DNA is organised into chromosomes; many traits depend on multiple genes and environment.

How this model works

All four equally likely gamete pairings are enumerated for one diploid locus.
Complete dominance is assumed; A is a symbol, not a claim about a human trait.

A one-locus complete-dominance model using abstract alleles, not human trait, sex or health prediction.

YOUR EVIDENCE

Laboratory notebook.

Saved only in this browser when storage is available. The most recent 12 trials are retained. Avoid personal information.

Your first predicted experiment will appear here.

CONNECT THE IDEAS

What does the evidence tell you?

1. For Aa × Aa, what is the expected probability of aa?One in fourExactly one of every four birthsZero

2. Which statement accurately describes this investigation?One successful run proves complete mastery.The model shows selected relationships and leaves other processes out.All displayed indices are real measured biological rates.

Build your investigation record.

Inspect two different structures
Record two trials with only one changed input
Explain the model through both conceptual checks
Save a conclusion of at least 12 characters

These markers record practice evidence. A written reflection is not automatically assessed, and one investigation does not establish mastery.

Next: Environment and Interdependence

YOUR LAB GUIDE

A little help
thinking it through.

Contextual prepared guidance works without an AI service. No questions leave this browser.

Prepared local guide

Class 10 · Reproduction and Heredity. Alleles are variants at a gene locus; offspring receive an allele from each parent in this model. Expected proportions describe probabilities; small families need not match those proportions. DNA is organised into chromosomes; many traits depend on multiple genes and environment. Before running: Does a 3:1 expected phenotype ratio guarantee the next four offspring? Change one input while keeping the others fixed. What do you expect?

LEARNING CONTEXT

Science · Class 10

Formative exploration

Science
Reproduction; Heredity

The 2026–27 teacher note excludes Heredity and Evolution from year-end assessment although heredity appears in Unit II. Treat inheritance here as formative; confirm school guidance. Recheck each academic year.

Sources and verification scope

CBSE Science X · 2026–27 ↗

Unit II / Unit V, PDF pp. 5–6; assessment teacher note p. 6

Checked 2026-10-22 · 2026–27

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