Learning objective

Utilize genetic diagrams to forecast the outcomes of monohybrid crosses and compute phenotypic ratios, specifically 1:1 and 3:1 ratios.

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Exam focus

Cambridge IGCSE BiologyInheritanceCore content

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Quick explanation

This point belongs to Monohybrid inheritance, especially Monohybrid inheritance outcomes.
You need to be able to utilize genetic diagrams to forecast the outcomes of monohybrid crosses and compute phenotypic ratios, specifically 1:1 and 3:1 ratios.
The key ideas to know are Calculate and Use.
Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

CalculateUse

Why it matters

This objective helps connect Monohybrid inheritance outcomes to exam-style questions, flashcards, and revision notes for Monohybrid inheritance.

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Practice Questions7 linked questions

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Paper 3Theory (Core)2 marks

Description

Cross between a heterozygous yellow seed plant (Yy) and a homozygous green seed plant (yy).

Parent 1 alleles	Parent 2 alleles
Y	y
y	y

a
Identify the genotypes of the offspring from this cross.
Your answer
Aim for approximately 2 distinct marking points.
[2]

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