1. 2-Factor Punnett Square Notes

2. 2-Factor Punnett Square Notes
1-3
1-4
2-3
2-4
BBTt x bbTt bt bT bt bT BT
BbTT
BbTt
BbTT
BbTt
BbTt
Bbtt
BbTt
Bbtt Bt
BbTT
BbTt BT
BbTT
BbTt
Bbtt
BbTt
Bbtt
BbTt Bt

3. Ratios 4 8 4 Genotypic Ratio: Phenotypic Ratio:
BBTT: BBTt: BbTT: BbTt: BBtt: Bbtt: bbTT: bbTt: bbtt
: : : : : : : :
Phenotypic Ratio:
Dom/Dom: Dom/Rec: Rec/Dom: Rec/Rec
(First 4: Next 2: Next 2: Last 1) 4 8 4
____12__ : ___4____ : ___0___ : ____0___

4. 2-Factor Punnett Square Notes
1-3
1-4
2-3
2-4
BbTt x BbTt bt BT Bt bT BT
BBTT
BBTt
BbTT
BbTt
BBTt
BBtt
BbTt
Bbtt Bt
BbTT
BbTt bT
bbTT
bbTt
bbtt
BbTt
Bbtt
bbTt bt

5. Answer the following questions using the Punnett Square:
a. How many offspring have the genotype, BbTt?
4/16 or 1/4
b. How many offspring have the genotype, bbTt?
2/16 or 1/8
c. How many offspring have the genotype, BBTT?
1/16
d. How many offspring will be Brown-eyed and short?
3/16
e. How many offspring will be Blue-eyed and short?
f. How many offspring will be Brown-eyed and tall?
9/16