2 Factor Crosses
NAME: _____________________________
DATE: __________________
PER: __________
TWO-FACTOR CROSSES
1. Parents: RRYy (dad) X RrYy (mom)
R: Round pea
r: wrinkled pea
Y: yellow color
y: green color
A. What is the phenotype of the Dad:_______________ AND _______________
B. What is the phenotype of the Mom:_______________ AND _______________
C. What are the possible alleles the parents can pass down?
Dad
Mom
1.
3.
1.
3.
2.
4.
2.
4.
D. FILL IN the Punnett square AND LEAVE ROOM to draw the offspring
E. Underline the offspring who have round peas that are green.
F. Circle the offspring who have wrinkled peas that are yellow.
G. What genotype is the most prominent in the cross?
H. What phenotype is most prominent in the cross?
2 Factor Crosses
2. Parents: rrYy (dad) X RrYy (mom)
R: Round pea
r: wrinkled pea
Y: yellow color
y: green color
A. What is the phenotype of the Dad:_______________ AND _______________
B. What is the phenotype of the Mom:_______________ AND _______________
C. What are the possible alleles the parents can pass down?
Dad
Mom
1.
3.
1.
3.
2.
4.
2.
4.
D. FILL IN the Punnett square AND LEAVE ROOM to draw the offspring
E. Underline the offspring who have round peas that are green.
F. Circle the offspring who have wrinkled peas that are yellow.
G. What genotype is the most prominent in the cross?
H. What phenotype is most prominent in the cross?
2 Factor Crosses
Complete the following 2 factor cross beginning with the ‘purebred’ parents
S:__________________
s: ______________ B: ________________
b: ________________