animations 4.1 (black) 1 aa : 2 aa : 1 aa complete dom/rec dom dom rec incomplete dominance dom...
Post on 20-Dec-2015
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(black)
1 AA : 2 Aa : 1 aa complete dom/rec dom dom rec incomplete dominance dom blend dom-rec rec codominant dom1 dom1+ dom2 dom2 recessive lethal (dom. marker) dead dom rec
1 gene with 2 alleles
we’ve seen 4 cases:
IA & IB are co-dominant; i is recessive
1 Gene with 3 alleles
IC. Genes with multiple alleles
Hierarchy of dominance:C > cch > ch > c
IC. Genes with multiple alleles
IC. Genes with multiple alleles
chinchillacch
IC. Genes with multiple alleles
chinchillacch
IC. Genes with multiple alleles
chinchillacch
himalayanch
Hierarchy of dominance:C > cch > ch > c
IC. Genes with multiple alleles
IC. Genes with multiple alleles
A short list of the 1587 known mutant alleles of the Drosophila melanogaster eye color gene w (white)
IC. Genes with multiple alleles
Back to 2 genes
TIME
ID. Two genes, interacting
ID. Two genes, interacting
A/A ; B/B
a/a ; b/b
A/a ; B/b self-cross
A/_ ; B_/
A/_ ; b/b
a/a ; B_/
a/a ; b/b
ww m+ & m
Coat color:Genes
A, B, C, D, E, S
A
AY
B
Ccc
C
C
D
E
E
II. Mention epistasis versus suppression
S
III.
Genotype -> Phenotype . . .but with interactions of unknown other genes, environment. . . + ,
Lack ofPenetrance
Variable Expressivity
Lack ofPenetrance
.4
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