Table 6
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Genotypes

Phenotypes

a

b

c

d

e

1 AABB

 

 

 

 

 

2 AABb

 

 

 

 

 

2 AaBB

 

 

 

 

 

4 AaBb

 

 

 

 

 

1 AAbb

 

 

 

 

 

2 Aabb

 

 

 

 

 

1 aaBB

 

 

 

 

 

2 aaBb

 

 

 

 

 

1 aabb

 

 

 

 

 

Segregation

9:3:3:1

12:3:1

15:1

1:4:6:4:1

9:7

Phenotype determination:

    a =  factor A is dominant over a, factor B is dominant over b, and there is no gene interaction

    b =  factor A is epistatic of Bb and bb

    c =  factor A is equidirectional substituted by B, and factor B is equidirectional substituted by A

    d =  the dominant alleles A and B show additive interaction in the same direction, i.e. AABb = AaBB,  AaBb = AAbb etc

    e =  factor A can only be phenotypically expressed when A and B are present due to complementary gene action

 

TABLE 6: Genotypic and phenotypic segregation in F2 populations considering two genes and interacting in different manners

© by R. Schlegel 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014

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