Coat color in labrador retrievers is determined, in part, by two genes; B for black pigment (with bb being chocolate) and E for deposition of the pigment in the hairs (with ee resulting in a yellow lab). Cross a male chocolate lab that is heterozygous for pigment deposition with a female yellow lab heterozygous for black pigment. What pheotypic ratio do you get? Black, chocolate, yellow?
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Parents- bbEe X Bbee
Gametes- (bE,be) and (Be,be)
F1-
-------bE------be-----
--Be--BbEe---Bbee----
--be--bbEe---bbee----
So, Black- 2
Chocolate- 2
Yellow- 2
Gametes- (bE,be) and (Be,be)
F1-
-------bE------be-----
--Be--BbEe---Bbee----
--be--bbEe---bbee----
So, Black- 2
Chocolate- 2
Yellow- 2