Dihybrid Inheritance (AQA A-Level Biology): Flashcards

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Dihybrid Inheritance
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Dihybrid inheritance definition

Inheritance of 2 different traits controlled by genes on separate chromosomes

F1 genotype from RRGG×rrggRRGG \times rrgg

RrGgRrGg

F2 phenotypic ratio in dihybrid cross

9:3:3:1

Number of gamete types from RrGgRrGg parent

Four types

Mendel's law of independent assortment

Each pair of alleles combines randomly with other allele pairs

Why alleles on different chromosomes assort independently

Chromosomes arrange randomly during meiosis

F1 phenotype from RRGG×rrggRRGG \times rrgg

All round, yellow (dominant traits only)

Four gamete types from RrGgRrGg

RGRG, RgRg, rGrG, rgrg

Mendel's two pea plant traits studied

Seed shape (round/wrinkled) & seed colour (yellow/green)

Key principle of dihybrid inheritance

Genes on separate chromosomes behave independently in meiosis

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