Incomplete Dominance vs. Codominance
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Transcript of Incomplete Dominance vs. Codominance
Incomplete Dominance vs.Codominance
There are two special types of inheritance: Incomplete Dominance and Codominance
Incomplete Dominance – A heterozygous situation where the two different alleles blend together.
One parent flower is red (CR CR). The other parent is white (Cw Cw).
CR CR
CW
CW
CRCW CRCW
CRCW CRCW
CRCR = 0/4 =
0% = CRCW = 4/4
= 100% = CWCW= 0/4
= 0% =
PinkRed
White
One parent flower is Pink (CR CW). The other parent is Pink (CR CW).
CR CW CR
CW
CRCR CRCW
CRCW CWCW
CRCR = 1/4 =
25% =CRCW = 2/4
= 50% = CWCW= 1/4
= 25% =
PinkRed
White
The second type of special inheritance is called codominance.
Codominance – A heterozygous situation where the two different alleles are equally dominant and they both get expressed.
One parent horse is black (FB FB). The other parent is white (FW FW).
FB FB
FW
FW
FB FW FB FW
FB FW FB FW
FB FB = 0/4 =
0% = FB FW = 4/4
= 100% = FW FW= 0/4
= 0% =
SpottedBlack
White
One parent horse is black (CB CB). The other parent is spotted (CB Cw).
CB CB
CB
CW
CBCB CBCB
CBCW CBCW
CBCB = 2/4 =
50% = CBCW = 2/4
= 50% = CWCW= 0/4
= 0% =
SpottedBlack
White
To review: Codominance happens when both alleles are
equally dominant and both alleles get expressed.
Incomplete dominance happens when the heterozygous alleles get blended.