Complex Patterns of Inheritance

By: Jahlei Jones

Multiple alleles

Definition: series of three or more alternative or Allelic forms of a gene.

Offspring phenotype: There are no offspring phenotype

Example(s):

1)Blood type A is an example of Multiple Alleles.

2)Different hair colors and multiple alleles examples.

Incomplete dominance

Definition: a genetic situation in which one allele does not completely dominate another allele, and therefore results in a new phenotype.

Offspring phenotype:It will be a mix between the two parents.

Examples:

1)A snapdragon flower that is pink as a result of cross-pollination between a red flower and a white flower when neither the white or the red alleles are dominant.

2)A child with wavy hair as a result of one parent's curly hair and the other's straight hair.

Codominance

Definition:a relationship between two versions of a gene.

Offspring phenotype: Both parents traits will be seen in the off spring

Example(s):

1) A Red flower and a white flower will create a red and white spotted flower.

2)A white chicken and a black chicken will create a chicken that is checkered with white and black.

Polygenic traits

Definition: one whose phenotype is influenced by more than one gene.

Offspring phenotype: Traits that display a continuous distribution, such as height or skin color.

Example(s):

1)A humans skin color is an example

2)A humans height is another example