Probability & Genetic Crosses (AQA A-Level Biology): Quizzes

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Probability & Genetic Crosses
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What do ratios help us understand in genetic crosses?

Relationship between dominant and recessive traits

How do you simplify a genetic ratio to its simplest form?

Divide each number by smallest value

Why do actual genetic cross results rarely match theoretical predictions exactly?

Statistical error & natural variation

Is deviation from predicted ratios an indication of experimental error?

No, it is normal and expected

How does sample size affect accuracy of genetic cross results?

Larger samples closer to predictions

How does each fertilisation event relate to previous ones?

Each is independent of others

Which Mendel trait showed ratio closest to theoretical 3:13:1 with sample size 8021?

Cotyledon colour at 3.01:13.01:1

What did Mendel's data show about sample size and accuracy?

Largest samples gave closest to 3:13:1

What is the theoretical ratio predicted for a monohybrid cross?

3:13:1

Why do smaller samples show greater deviation from expected ratios?

Individual chance events have more impact

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