Can someone actually help me with this...? Instead of telling me to use my books... (My school does NOT give us books.!)
How is incomplete dominance different than dominance?
Explain why incomplete dominance only occurs in this genotype?
Since this is not my area of expertise, I searched Google under the key words "genotype complete incomplete domnance" to get these possible sources:
https://www.google.com/search?client=safari&rls=en&q=genotype+complete+incomplete+domnance&ie=UTF-8&oe=UTF-8&gws_rd=ssl
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.
Thanks so much!!
Of course, I can help you with that! In order to understand the difference between incomplete dominance and dominance, we should first clarify what these terms mean.
In genetics, dominance refers to when one allele (variant of a gene) completely masks the expression of the other allele in a heterozygous genotype. This means that if an organism inherits one dominant allele and one recessive allele for a particular trait, the dominant allele will be the one that is expressed in their phenotype, or observable characteristics.
On the other hand, incomplete dominance occurs when neither allele is completely dominant over the other, resulting in a blending or intermediate phenotype in the heterozygous genotype. In this case, both alleles contribute to the phenotype, resulting in a mixture or combination of traits from each allele.
Now, to understand why incomplete dominance only occurs in certain genotypes, we need to look at the specific genetic interactions involved. Incomplete dominance is observed when the heterozygous genotype results in a different phenotype than either homozygous genotype. This occurs due to the interaction between the alleles at the molecular level.
To explain this further, let's take an example with flower color. Imagine we have a flower gene with two alleles: red (R) and white (W). In a case of complete dominance, if an individual has the genotype RR (homozygous dominant) or Rr (heterozygous), the flower color would be red, and the white allele would be completely masked. However, if an individual has the genotype WW (homozygous recessive), the flower color would be white.
In the case of incomplete dominance, if an individual has the genotype RW (heterozygous), the resulting flower color would be a blending of both red and white, such as pink or a lighter shade of red. Neither allele is completely dominant over the other, which is why the phenotype is not red or white, but a combination of the two.
It's important to note that incomplete dominance is specific to certain traits and genotypes. Not all traits exhibit incomplete dominance, and the occurrence of incomplete dominance depends on the specific alleles and the molecular interactions between them.
I hope this explanation has helped you understand the difference between incomplete dominance and dominance, as well as why incomplete dominance only occurs in certain genotypes. If you have any further questions, feel free to ask!