Gene Interactions Flashcards
What is the ratio of a typical dihybrid cross?
9:3:3:1
What is the no interaction definition?
When two genes independently contribute to a single phenotype
What does it mean when we see a 9:3:3:1 ratio?
Two genes
Autosomal
On different chromosomes
No gene interaction
What is the definition of complementary genes?
When two genes are both needed to produce a wild type phenotype
9:7 ratio
What does it mean when we see a modified 9:3:3:1 ratio?
Two genes
Autosomal
On different chromosomes
There is gene interaction
What is the definition of duplicate genes?
When either of two genes is needed to produce a wild type phenotype
15:1 ratio
What is the definition of discontinuous variation?
When a character is found in two or more distinct forms in a population
What is the definition of continuous variation?
When a character is found in a range of forms in a population
What is epistasis?
When one gene conceals another gene
What is the definition of recessive epistasis?
When the recessive phenotype of one gene conceals the phenotype of a second gene
What is the definition of dominant epistasis?
When the dominant phenotype of one gene conceals the phenotype of another gene
