Download GENE GENE INTERACTION DOMINANCE

GENE GENE INTERACTION
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DOMINANCE:-When one member of allellic pair marks the
expression of the other member then it is known as dominance.
EPISTASIS:-When there is suppression of action of a gene then
it is known as epistasis.
HYPOSTASIS:-These are those genes whose action is
suppressed.
TYPES OF EPISTASIS
1)
2)
3)
Recessive epistasis
Dominant epistasis
Dominant-Recessive epistasis
RECESSIVE EPISTASIS
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COMPLEMENTARY GENE INTERACTION:- Either
gene when homozygous recessive is epistatic to the other
.Such genes are called complementary genes.
•SUPPLEMENTARY EPISTASIS:-COAT
COLOUR IN MICE IS EXAMPLE OF RECESSIVE
EPISTASIS
.IN MICE BLACK,ALBINO AND
AGOUTI PATTERNS OF COAT COLOUR ARE
SEEN.
DOMINANT EPISTASIS
It is also known as duplicate gene . When two gene
pairs seem to be identical in function ,either
dominant gene or both dominant gene together
give the same effect. Such genes are called
duplicate genes and the type of epistasis is called
dominant epistasis.
DOMINANT- RECESSIVE EPISTASIS
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It is defined as when one gene is dominant is
epistatic to the other gene when homozygous is
epistatic to the first one.
POLYMERIC EFFECT
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Either dominant gene show the same effect but
interaction between them shows a new
phenotypic
PLEIOTROPY
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When one gene effect one character but there are
many cases where one gene influences more than one
character and such genes are known as pleiotropic
genes.