Selfing and Linkage (Leaving Cert Biology): Flashcards

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Selfing and Linkage
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Selfing

Crossing a genotype with the same genotype

F₂ generation

Second filial generation from crossing two F₁ individuals

Dihybrid cross

Cross looking at two different traits at same time

Dihybrid cross ratio (independent assortment)

9:3:3:19:3:3:1

Genetic linkage

Genes/alleles located on the same chromosome

How linked genes are inherited

Passed on together to next generation

Linked genes & independent assortment

Don't follow it; stay together on same chromosome

Gamete ratio: unlinked genes

1:1:1:11:1:1:1 (four types, 25% each)

Gamete ratio: linked genes

1:11:1 (two types, 50% each)

Chromosome location: unlinked genes

Different chromosomes

Chromosome location: linked genes

Same chromosome

F₂ phenotypic ratio: unlinked genes

9:3:3:19:3:3:1

Ratio indicating genetic linkage

1:11:1

Mendel's law contradicted by linkage

Second law (independent assortment)

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