
Answer Key.
Converting Genotype into Phenotype:
What do the following individuals look like?
1 If A is dominant to a, what do "AA" "Aa" and "aa" look like?
2 If B and b are codominant, what do "BB" "Bb" and "bb" look like?
3 If c is recessive to C, what do "CC" "Cc" and "cc" look like?
4 If D is dominant to both d1 and d2, and d1 and d2 are codominant to each other, what do "DD" "Dd1" "Dd2" "d1d1" "d2d2" and "d1d2" look like?
Beginner:
Practice FOIL:
5 BB x Bb
6 bb x Bb
7 bb x bb
8 Bb x Bb
9 BB x bb
Intermediate:
Combine two results. Use FOIL on each trait, then combine with a grid.
10 CCDD x CcDD
11 ccDd x ccdd
12 CCdd x ccDD
13 CcDd x CcDd
14 Ccdd x CcDd
Advanced:
Use FOIL for each trait to get all three results. Combine two into a grid, then add the third.
15 aabbcc x AaBbCc
16 aaBbCc x AabbCc
17 AaBbCc x aaBbcc
18 AaBbCc x AaBbCc
Expert:
Use the shortcut shown in Step 9 by multiplying "odds per locus" to find the desired outcome.
19 When crossing AaBbCcDdee x aaBbccDdEe, what are the odds of getting aabbccddee?
20 When crossing AaBbCcDdEe X AaBbCcDdEe, what are the odds of getting aabbCcddee?
21 When crossing AaBbCcDdEe X AaBbCcDdEe, assuming "e" is recessive, what are the odds of getting offspring showing recessive traits a, b, c, and d, but not e?
Answer Key.
