co-dominance ?

[forensic-d]

can you tell me the difference between co-dominance and incomplete dominance

[LucidDreamer]

Incomplete dominance is when two traits are expressed at once, and they are blended together. For example, one allele normally produces a white flower and another allele produces a red flower, but when you have a genotype with one of each allele you end up with a pink flower.

 

Codominance is also when two traits from two alleles are expressed at once, but instead of a blending of traits, all of the traits are expressed at once without any reduction. So if you had a flower with codominace for a red color allele and a white color allele, then you might have two flowers, one white and the other red.

[Dak]

Sort of. it's this:

 

 

W = white allele, R = red allele. Y = yellow allele

 

DOMINANCE: if R is dominant over w, then the presence of R will make the flower red, reguardless of how many R alleles are present; it is nessesary to have two w alleles in order to have a white flower. ie:

 

ww = white flower

 

wR = red flower

 

RR = red flower.

 

this would be because the base color of the flower is white, the w allele doesnt code for a pigment and the R allele codes for a red pigment. therefore, two w alleles leaves the flower white. any R alleles produce red pigment and make the flower red.

 

INCOMPLETE DOMINANCE: if R is incompletely dominant over w, then the presence of R will express itself over w; however, two Rs express themselves twice as much as one R. ie:

 

ww = white

 

wR = pink

 

RR = red

 

This would be because the base color of the flower is white, the w allele doesnt code for a pigment and the R allele codes for a weak red pigment. therefore, two w alleles leaves the flower white. two R alleles produce red pigment and make the flower red. one R allele produses red pigment, but not enough to make the flower completely red, and it is therefore pink instead

 

CO-DOMINANCE: If R and Y are co-dominant, then they will both express themselves over other alleles; if Y and R are present together, then they will both be expressed and their phenotypes combined. ie:

 

ww = white

 

Rw = red

 

RR = red

 

Yw = Yello

 

YY = Yello

 

RY = orange

 

This would be because the base color of the flower is white, the w allele doesnt code for a pigment, the R allele codes for a red pigment, and the Y allele codes for a yellow pigment. therefore, two w alleles leaves the flower white. two R alleles/an R and a resessive w allele produce red pigment and make the flower red; two Y alleles or a Y and a resessive w allele produce yellow pigment and make the flower yellow. One R and one Y allele produce both red and yellow pigment, which combine to give an orange plant.

[forensic-d]

thanks for your replies i understand it a lot better now