When true-breeding mice with brown fur and short tails (BBtt) were crossed to true-breeding mice with white fur and long tails (bbTT), all the F1 offspring had brown fur and long tails. The F1 offspring were then crossed to mice with white fur and short tails (bbtt). The fur gene and the tail length gene are 7 cM apart. Part a Which of the following F2 offspring are recombinant? (Select all that apply.) a) White fur, short tail b) Brown fur, long tail c) You need more information to answer this question. d) White fur, long tail e) Brown fur, short tail
When true-breeding mice with brown fur and short tails (BBtt) were crossed to true-breeding mice with white fur and long tails (bbTT), all the F1 offspring had brown fur and long tails. The F1 offspring were then crossed to mice with white fur and short tails (bbtt). The fur gene and the tail length gene are 7 cM apart.
Part a
Which of the following F2 offspring are recombinant? (Select all that apply.)
a) White fur, short tail
b) Brown fur, long tail
c) You need more information to answer this question.
d) White fur, long tail
e) Brown fur, short tail
Part b
Using the information given in Part a, if there were 400 mice in the F2 generation, how many do you expect would have white fur and long tails?
a) 25
b) 186
c) 14
e) 28
f) 75
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