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(black). Dominant allele with recessive lethality. 1 gene with 2 alleles we’ve seen 4 cases:. Dominant allele with recessive lethality. 1 AA : 2 Aa : 1 aa complete dom/rec dom dom rec

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(black)

Dominant allele with recessive lethality


1 gene with 2 alleles

we’ve seen 4 cases:

Dominant allele with recessive lethality

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


IC. Genes with multiple alleles

1 Gene with 3 alleles

IA & IB are co-dominant; i is recessive


IC. Genes with multiple alleles

Hierarchy of dominance:

C > cch > ch > c


IC. Genes with multiple alleles

chinchilla

cch


IC. Genes with multiple alleles

chinchilla

cch


IC. Genes with multiple alleles

chinchilla

cch

himalayan

ch


IC. Genes with multiple alleles

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)


ID. Two genes, interacting

Back to

2 genes

TIME


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


cc

C


C


C


D


E


E


II. Mention epistasis versus suppression


S


III.

Genotype -> Phenotype

. . . but with interactions of unknown other genes, environment, + . . .


Lack of

Penetrance

Variable

Expressivity

Lack of

Penetrance


.4


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