You wanted to identify the Lab with the BBEE genotype from F2 progeny of Cross II....
You wanted to identify the Lab with the BBEE genotype from F2 progeny of Cross II. You did a testcross of one black Lab with unknown genotype (B_E_) with the yellow Lab (bbee). What kinds of the puppies you may get from this testcross?
A. all black
B. 1 black to 1 brown ratio
C. 1 black to 1 brown to 2 yellow ratio
D. A and C
E. all of the above
Homework Answers
B_E_ * bbee
if the genotype of the black Labrador is BBEE
BBEE* bbee
BbEe ( F1)
F1 progenies will be all black..
if the genotype of the black labrador is BbEE
BbEE * bbee
| BE | bE | |
| be | BbEe ( black) | bbEe ( brown) |
the expected ratio is black:brown=1:1
if the genotype of the black labrador is
BBEe * bbee
| BE | Be | |
| be | BbEe ( black) | Bbee ( yellow) |
the expected ratio is black: yellow=1:1
if the black labrador is BbEe
BbEe * bbee
| BE | Be | bE | be | |
| be | BbEe (black) | Bbee (yellow) | bbEe ( brown) | bbee ( yellow) |
black:brown:yellow=1:1:2
so the answer is E) all of the above.
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