Chapter 5 Question 14(i): Complete linkage
Another question:
I understand the cross between AB/ab x AB/ab creates 2 phenotypes.
But... with the 1.Ab/2.aB x 3.Ab/4.aB cross, however, I get 3 different phenotypes, A-bb (1x3), A-B- (1x4) and aaB- (2x4). I do not see where I went wrong.
(I have numbered the allele sets to show how I crossed them)
The first cross is essentially a mono-hybrid cross because of the complete linkage causes A and B to act as one gene.
The second cross makes more sense if you remember that A and B are always linked and on the same chromosome. So Ab/aB could be written as [AB]b/a[AB] where [AB] is essentially one gene. This cross is really a mono-hybrid with two homozygous parents for AB (e.g. AB x AB).
update 2.9.09
The second portion could also be interpreted as two sets of linkages: A linked b and B linked a. If this is the case then you would end up with three possible phenotypes in the F1 progeny.
- AbBa
- AbAb
- BaBa
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