Topscore error

[hawk52]

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sorry if this has been posted, but I believe this is an error. test 1, q. 33. Reads something like you cross a TTRR (tall,red)with ttrr (short white). What are the F2 generation phenotype?

To me, all of the phenotypes in the next generation must be TtRr, making them all tall and red due to tall and red dominance.. They give the 9:3:3:1 anwser. I cant imagine this is right.

 

[huskerslp]

You would be right if they were asking you about the phenotype of the F1 generation. However, they are asking you about the F2 generation. I think topscore left out the condition that the F1 generation was self-crossed. That is the only way you can get the 9:3:3:1 ratio.

 

[hawk52]

You would be right if they were asking you about the phenotype of the F1 generation. However, they are asking you about the F2 generation. I think topscore left out the condition that the F1 generation was self-crossed. That is the only way you can get the 9:3:3:1 ratio.

Thats what i was thinking but as i was taking it, you had no way to tell what the offspring would be crossed with. I think they try to hard to be tricky and kinda lose sight of the question at hand.

 

[dat_student]

Thats what i was thinking but as i was taking it, you had no way to tell what the offspring would be crossed with. I think they try to hard to be tricky and kinda lose sight of the question at hand.

I AM NOT SURPRIZED.