Click here to access an interactive website to review the concepts of incomplete dominance and codominance. On the website click on enter web lab and follow the instructions. The last slides are practice problems. How did you do?
1. What is incomplete dominance?
2. What is codominance?
3. Why can the genotypes of traits inherited in a codominant or icomplete dominant manner be written as R1R1, R1R2, R2R2?
1. What is incomplete dominance?
ReplyDeleteIncomplete dominance is when instead of having a phenotype based on simply a dominant or recessive allele, you get a blend of both alleles received. (Ex: Red+white=pink)
2. What is codominance?
Codominance is when instead of one allele being recessive or dominant, both alleles are dominant, and are both shown in the phenotype. (Ex: Type A blood+Type B blood=Type AB blood)
3. Why can the genotypes of traits inherited in a codominant or incomplete dominant manner be written as R1R1, R1R2, R2R2?
In codominance, when both alleles are shown, such as R1 and R2, the cross is shown as the phenotype is shown, with both present. And in incomplete dominance, to show the mix of both alleles, it's shown as just putting the two together, such as R1+R2=R1R2.
This was actually really helpful, thanks!
1. Incomplete dominance is when both parental traits appear as a blend. ex color of flowers. male= red female= white. red+white=pink
ReplyDelete2. Codominance is when both traits appear in the phenotype.
ex color of a flower male=red female=white red+white= red with white dots
3. It means the same as how we o the key except when you have R1R1 it mean RR and when you have R2R2 it means rr and when you have R1R2 it means Rr
1. Incomplete dominance is when the traits received by your parents appear in the offspring as a blend. For example in snapdragon flowers if one parent is red, and one is white, the F1 generation will appear pink.
ReplyDelete2. Codominance is when both traits received from the parental generation appear in the offspring. For example in snapdragons, if one parent was red, and one was white, the F1 generation all of the flowers will be red and white (patches/spots).
3. The genotypes of traits inherited in a codominant or incomplete dominant manner can be written as R1R1, R2R2, or R1R2. Usually we write them as RR, rr, Rr, but capital letters indicate that the allele for that trait is dominant over the other one; in incomplete dominance and codominance, one allele is never dominant over the other one, so we give the wrong impression by writing in with capital and lowercase letter. Therefore, we write all the letters capital, but differentiate them by putting a 1 or 2 in second and fourth slot (instead of a lowercase or capital letter).
By the way, Ms. Alonso, I saw two new articles in the Science times today - One was about how 1 in 4 parents believe that vaccines given during infancy cause autism (since we were talking about that) and the other was about how an infection may spur Alzheimer's (since there was recently a talk about infectious diseases for the 7th grade).
ReplyDelete1.What is incomplete dominance?
ReplyDeleteIncomplete dominance is when the parents give their offspring a mixture of the traits. For example, when you have a red-faced oompah-loompa, and a blue-faced oompah-loompah, their offspring will be purple-faced oompah-loompahs.
2.What is codominance?
Codominance is when both of the traits show up in the offspring. For example, if you have a red flower and a white flower, the offspring will have both red and white colors.
3.Why can the genotypes of traits inherited in a codominant or incomplete dominant manner be written as R1R1, R1R2, R2R2?
The reasoning behind this is that sometimes one can get the wrong idea by thinking that one of alleles is dominant over the other since it is represented by capital and lowercase letters.
the cow in the picture, that's codominence, right?
ReplyDeleteimcomplete dominence is the blend of both traits,
ex. red+white=pink
and codominence is both traits showing in the organism,
ex. red+white=red and white
- rae