Using Fork-Line Method:

MONOHYBRID

a. RR x rr = Rr x Rr b. YY x yy = Yy x Yy

R ¼ RR Y ¼ YY

2/4 Rr 2/4 Yy

r ¼ rr y ¼ yy

(Shape) (Color)

Round & Wrinkled Yellow & Green

c. TT x tt = Tt x Tt

T ¼ TT

2/4 Tt

t ¼ tt

(Height)

Tall & Short

DIHYBRID

Shape & Color

1/4 RR x 1/4 YY = 1/16 RRYY1/4 RR x 2/4 Yy = 2/16 RRYy1/4 RR x 1/4 yy = 1/16 RRyy

2/4 Rr x 1/4 YY = 2/16 RrYY2/4 Rr x 2/4 Yy = 4/16 RrYy2/4 Rr x 1/4 yy = 2/16 Rryy

1/4 rr x 1/4 YY = 1/16 rrYY1/4 rr x 2/4 Yy = 2/16 rrYy1/4 rr x 1/4 yy = 1/16 rryy

Ratio (no specific order): 4:1:1:1:1:2:2:2:2

TRIHYBRID

Shape, Color, & Height

SET 1:1/4 RR x 1/4 YY = 1/16 RRYY x 1/4 TT = 1/64 RRYYTT1/4 RR x 1/4 YY = 1/16 RRYY x 2/4 Tt = 2/64 RRYYTt1/4 RR x 1/4 YY = 1/16 RRYY x 1/4 tt = 1/64 RRYYtt

1/4 RR x 2/4 Yy = 2/16 RRYy x 1/4 TT = 2/64 RRYyTT1/4 RR x 2/4 Yy = 2/16 RRYy x 2/4 Tt = 4/64 RRYyTt1/4 RR x 2/4 Yy = 2/16 RRYy x 1/4 tt = 2/64 RRYytt

1/4 RR x 1/4 yy = 1/16 RRyy x 1/4 TT = 1/64 RRyyTT1/4 RR x 1/4 yy = 1/16 RRyy x 2/4 Tt = 2/64 RRyyTt1/4 RR x 1/4 yy = 1/16 RRyy x 1/4 tt = 1/64 RRyytt

SET 2:2/4 Rr x 1/4 YY = 2/16 RrYY x 1/4 TT = 2/64 RrYYTT2/4 Rr x 1/4 YY = 2/16 RrYY x 2/4 Tt = 4/64 RrYYTt2/4 Rr x 1/4 YY = 2/16 RrYY x 1/4 tt = 2/64 RrYYtt

2/4 Rr x 2/4 Yy = 4/16 RrYy x 1/4 TT = 4/64 RrYyTT2/4 Rr x 2/4 Yy = 4/16 RrYy x 2/4 Tt = 8/64 RrYyTt2/4 Rr x 2/4 Yy = 4/16 RrYy x 1/4 tt = 4/64 RrYytt

2/4 Rr x 1/4 yy = 2/16 Rryy x 1/4 TT = 2/64 RryyTT2/4 Rr x 1/4 yy = 2/16 Rryy x 2/4 Tt = 4/64 RryyTt2/4 Rr x 1/4 yy = 2/16 Rryy x 1/4 tt = 2/64 Rryytt

SET 3:1/4 rr x 1/4 YY = 1/16 rrYY x 1/4 TT = 1/64 rrYYTT1/4 rr x 1/4 YY = 1/16 rrYY x 2/4 Tt = 2/64 rrYYTt1/4 rr x 1/4 YY = 1/16 rrYY x 1/4 tt = 1/64 rrYYtt

1/4 rr x 2/4 Yy = 2/16 rrYy x 1/4 TT = 2/64 rrYyTT1/4 rr x 2/4 Yy = 2/16 rrYy x 2/4 Tt = 4/64 rrYyTt1/4 rr x 2/4 Yy = 2/16 rrYy x 1/4 tt = 2/64 rrYytt

1/4 rr x 1/4 yy = 1/16 rryy x 1/4 TT = 1/64 rryyTT1/4 rr x 1/4 yy = 1/16 rryy x 2/4 Tt = 2/64 rryyTt1/4 rr x 1/4 yy = 1/16 rryy x 1/4 tt = 1/64 rryytt

TABLE 7.4: THE FORMULA USED IN DETERMINING THE GENOTYPE AND PHENOTYPE

Numberof

Distinct Traits

No. of Diff. Gametes for

each Trait

Numberof

Recombinations

No. of Distinct

Genotypes

No. ofDistinct

PhenotypesFORMULA n 2n 4n 3n 2n

SI

MPLEVALUES

1

2

3

4

5

10

2

4

8

16

32

1024

4

16

64

256

1024

1 084 576

3

9

27

81

243

59 049

2

4

8

16

32

1024