Epistasis

Question 1

What Is Recessive Epistasis?

What Is the Ratio?

Answer 1

Homozygous recessive alleles at 1 locus preventing phenotype expression at the other locus

Ratio 9:3:4

Question 2

What Is Dominant Epistasis?

What Is The Ratio?

Answer 2

Homozygous Dominant allele at one locus preventing phenotype expression at the other locus

Ratio 12:3:1

Question 3

What is Duplicate Recessive Epistasis/Complementary?

What Is the Ratio?

Answer 3

Either loci being homozygous recessive, masking the effect at the other loci

Ratio 9:7

Question 4

What Happens in Duplicate Recessive/Complementary Epistasis?

Answer 4

Colourless Precursor I —> Allele A converts its to —> Colourless Precursor II —> Allele B converts it to —> Purple

Question 5

What is Duplicate Dominant Epistasis?

What is the ratio?

Answer 5

Presence of dominant allele at either loci produces dominant phenotype

Ratio 15:1

Question 6

What is Duplicate Gene Epistasis?

What is the Ratio?

Answer 6

Dominant alleles at either locus produce the same phenotype

Ratio 9:6:1

Question 7

What is the General Formula For Epistasis?

Answer 7

Ratio 9:3:3:1