Online College Courses for Credit

Genetics Review

Genetics Review

Author: Jessica Libby
See More
Fast, Free College Credit

Developing Effective Teams

Let's Ride
*No strings attached. This college course is 100% free and is worth 1 semester credit.

29 Sophia partners guarantee credit transfer.

311 Institutions have accepted or given pre-approval for credit transfer.

* The American Council on Education's College Credit Recommendation Service (ACE Credit®) has evaluated and recommended college credit for 27 of Sophia’s online courses. Many different colleges and universities consider ACE CREDIT recommendations in determining the applicability to their course and degree programs.


Incomplete Dominance

Not all genes have alleles that are either dominant or recessive. In some cases, such as the color of snapdragons, the heterozygous genotype creates a new or blended phenotype. When a red and white snapdragon breed together they will produce pink flowers. 

Another example of incomplete dominance deals with the shape of blood cells. The homozygous dominant genotype result in a phenotype of normal erythrocytes. The homozygous recessive genotype result in a person have sickle cell shaped blood cells (cresent) and they will have sickle cell anemia. Individuals with the heterozygous genotype have some normal cells and some sickle cell shaped cells. People with this genotype have the special advantage of being immune to malaria.