epistasis inheritance Flashcards
1
Q
what is meant by epistasis ?
A
- when one gene masks or modifies the expression of another gene on a different locus
2
Q
what kind of genetic example is epistasis ?
A
- dihybrid
- involves 2 genes
3
Q
examples of epistasis (3)
A
- coat colour in mice
- coat colour in labradors
- fruit colour in vegetables
4
Q
coat colour in labradors
- what is the role of gene 1 ?
A
- controls whether pigment will be expressed
5
Q
coat colour in labradors
- what is the role of allele E ?
A
- dominant
- codes for pigment production
6
Q
coat colour in labradors
- what is the role of allele e ?
A
- recessive
- codes for no pigment
- dog will always stay yellow
7
Q
coat colour in labradors
what is the role of gene 2 ?
A
- controls which pigment is expressed
8
Q
coat colour in labradors - gene 2
what is the role of allele B ?
A
- dominant
- codes for black fur
9
Q
coat colour in labradors - gene 2
what is the role of allele b ?
A
- recessive
- codes for brown fur
