dihybrid cross

Last updated 2023.03.13 Edit Source

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the inheritance of two different traits controlled by two different genes

Labrador retrievers’ fur color
relationship of 2 genes with dominant-recessive inheritance

dominant B gives black color
recessive b gives brown
dominant E has no impact on black or brown
recessive e blocks the pigment deposition and causes yellow fur

black: BBEE, BbEE, BbEe, Bbee
brown: bbEE, bbee
yellow: BBee, Bbee, bbee

P: black (BBEE) x yellow (bbee)
F1: black (BbEe)

P: black (BbEe) x black (BBEe)
F2:

	BE	Be	bE	be
BE	BBEE	BBEe	BbEE	BbEe
Be	BBEe	BBee	BbEe	Bbee
BE	BBEE	BBEe	BbEE	BbEe
Be	BBEe	BBee	BbEe	Bbee

12 black
0 brown
4 yellow