Dihybrid Crosses
dihybrid crosses
dihybrid crosses
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Genetics<br />
<strong>Dihybrid</strong> <strong>Crosses</strong>
Monohybrid Cross<br />
P: Round vs Wrinkled Peas<br />
RR<br />
rr<br />
F1: All Round<br />
Rr<br />
F2: 3/4 Round: 1/4 Wrinkled<br />
1/4RR 2/4Rr 1/4rr<br />
What is the trait? Pea Shape<br />
Which phenotype is dominant? Round<br />
What are the alleles? R=round, r=wrinkled<br />
What are the 3 possible genotypes? RR, Rr, rr
<strong>Dihybrid</strong> Cross<br />
P: Round, Green vs Wrinkled ,Yellow<br />
RRyy<br />
gametes Ry<br />
F1: All Round, Yellow<br />
Which phenotypes are dominant?<br />
Alleles?<br />
R-round<br />
r-wrinkled<br />
Y-Yellow<br />
y-green<br />
Ry<br />
rrYY<br />
gametes rY<br />
rY<br />
RrYy<br />
RrYy<br />
Round, Yellow
<strong>Dihybrid</strong> Cross<br />
P: Round, Green vs Wrinkled ,Yellow<br />
RRyy<br />
rrYY<br />
F1: All Round, Yellow<br />
RrYy<br />
F2: 9/16 Round, Yellow,<br />
3/16 Round Green,<br />
3/16 Wrinkled Yellow,<br />
1/16 Wrinkled Green
F1 Cross<br />
Round, Yellow<br />
RrYy<br />
X<br />
Round, Yellow<br />
RrYy<br />
Gametes?<br />
RY<br />
Ry<br />
rY<br />
ry<br />
RY<br />
Ry<br />
rY<br />
ry
Punnett Square<br />
RRYY 1/16<br />
RRYy 2/16<br />
RRyy 1/16<br />
RrYY 2/16<br />
RrYy 4/16<br />
Rryy 2/16<br />
rrYY 1/16<br />
rrYy 2/16<br />
rryy 1/16<br />
RY<br />
Ry<br />
rY<br />
ry<br />
RY Ry rY ry<br />
RRYY RRYy RrYY RrYy<br />
RRYy RRyy RrYy Rryy<br />
RrYY RrYy rrYY rrYy<br />
RrYy Rryy rrYy rryy
<strong>Dihybrid</strong> Genotype Ratio<br />
RRYY 1/16<br />
RRYy 2/16<br />
RRyy 1/16<br />
RrYY 2/16<br />
RrYy 4/16<br />
Rryy 2/16<br />
rrYY 1/16<br />
rrYy 2/16<br />
rryy 1/16<br />
9/16 R_Y_ Round Yellow<br />
3/16 R_ yy Round Green<br />
3/16 rr Y_ Wrinkled Yellow<br />
1/16 rr yy Wrinkled Green
Forked Line Method<br />
RrYy x RrYy<br />
Rr x Rr<br />
1/4 RR<br />
2/4 Rr<br />
1/4 rr<br />
Yy x Yy<br />
1/4 YY<br />
2/4 Yy<br />
1/4 yy<br />
1/4 YY<br />
2/4 Yy<br />
1/4 yy<br />
1/4 YY<br />
2/4 Yy<br />
1/4 yy<br />
1/16 RRYY<br />
2/16 RRYy<br />
1/16 RRyy<br />
2/16 RrYY<br />
4/16 RrYy<br />
2/16 Rryy<br />
1/16 rrYY<br />
2/16 rrYy<br />
1/16 rryy
RrYy x rryy<br />
RY Ry rY ry ry<br />
RY Ry rY ry<br />
ry RrYy Rryy rrYy rryy<br />
1/4 RrYy 1/4 Rryy 1/4 rrYy 1/4 rryy<br />
1/4 Round<br />
Yellow<br />
1/4 Round<br />
Green<br />
1/4 Wrinkled<br />
Yellow<br />
1/4 Wrinkled<br />
Green
Rr x rr<br />
RrYy x rryy<br />
Yy x yy<br />
1/2 Rr<br />
1/2 Yy<br />
1/2 yy<br />
1/4 RrYy<br />
1/4 Rryy<br />
1/2 rr<br />
1/2 Yy<br />
1/2 yy<br />
1/4 rrYy<br />
1/4 rryy<br />
1/4 RrYy 1/4 Rryy 1/4 rrYy 1/4 rryy<br />
1/4 Round 1/4 Round 1/4 Wrinkled 1/4 Wrinkled<br />
Yellow Green Yellow Green<br />
1/4 RrYy
Your Turn<br />
RrYy x Rryy<br />
RrYYPp x rrYypp
RrYy x Rryy<br />
1/8 RRYy<br />
1/8 RRyy<br />
2/8 RrYy<br />
2/8 Rryy<br />
1/8 rrYy<br />
1/8 rryy<br />
3/8 round yellow<br />
3/8 round green<br />
1/8 wrinkled yellow<br />
1/8 wrinkled green<br />
Answers<br />
RrYYPp x rrYypp<br />
1/8 RrYYPp<br />
1/8 RrYYpp<br />
1/8 RrYyPp<br />
1/8 RrYypp<br />
1/8 rrYYPp<br />
1/8 rrYYpp<br />
1/8 rrYyPp<br />
1/8 rrYypp<br />
1/4 round, yellow, purple<br />
1/4 round, yellow, white<br />
1/4 wrinkled, yellow. purple<br />
1/4 wrinkled, yellow, white
RrYy x Rryy<br />
Rr x Rr Yy x yy<br />
1/4 RR<br />
2/4 Rr<br />
1/4 rr<br />
1/2 Yy<br />
1/2 yy<br />
1/2 Yy<br />
1/2 yy<br />
1/2 Yy<br />
1/2 yy<br />
1/8 RRYy<br />
1/8 RRyy<br />
2/8 RrYy<br />
2/8 Rryy<br />
1/8 rrYy<br />
1/8 rryy
RrYy x Rryy<br />
RY Ry rY ry<br />
Ry<br />
RRYy RRyy RrYy Rryy<br />
ry<br />
RrYy Rryy rrYy rryy<br />
1/8 RRYy<br />
1/8 RRyy<br />
2/8 RrYy<br />
2/8 Rryy<br />
1/8 rrYy<br />
1/8 rryy<br />
3/8 round yellow<br />
3/8 round green<br />
1/8 wrinkled yellow<br />
1/8 wrinkled green
RrYYPp x rrYypp<br />
Rr x rr<br />
1/2 Rr<br />
1/2 rr<br />
YY x Yy<br />
1/2 YY<br />
1/2 Yy<br />
1/2 YY<br />
1/2 Yy<br />
Pp x pp<br />
1/2 Pp<br />
1/2 pp<br />
1/2 Pp<br />
1/2 pp<br />
1/2 Pp<br />
1/2 pp<br />
1/2 Pp<br />
1/2 pp<br />
1/8 RrYYPp<br />
1/8 RrYYpp<br />
1/8 RrYyPp<br />
1/8 RrYypp<br />
1/8 rrYYPp<br />
1/8 rrYYpp<br />
1/8 rrYyPp<br />
1/8 rrYypp
RrYYPp x rrYypp<br />
RYP RYp rYP rYp<br />
rYp<br />
RrYYPpRrYYpp rrYYPp rrYYpp<br />
ryp<br />
RrYyPp RrYypp rrYyPp rrYypp<br />
1/4 round, yellow, purple<br />
1/4 round, yellow, white<br />
1/4 wrinkled, yellow. purple<br />
1/4 wrinkled, yellow, white
The End
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