1. THE MONOHYBRID CROSS THE DIHYBRID CROSS
GENETIC CROSSES
THE MONOHYBRID CROSS
THE DIHYBRID CROSS

2. First: Set up the Parental Cross P 1
A = axial flowers Male
a = terminal flowers Female
AA X aa

3. SET UP THE PUNNETT SQUARE

4. Put the Alleles in Separate Boxes

5. A Monohybrid Cross

6. Now Perform an F1 Cross A = axial flowers Male
a = terminal flowers Female
F1 = First Offspring
Aa X Aa

7. Put the Alleles in Separate Boxes

8. Perform the Cross

9. Assess The Genotype and Phenotypes
GENOTYPES
AA 1
Aa 2
aa 1
Ratio 1:2:1
PHENOTYPES
Axial Flowers (AA, Aa) 3
Terminal Flowers (aa) 1
Ratio 3:1

10. Assess The Genotype and Phenotypes
Axial Flowers 3
Terminal Flowers 1
Ratio 3:1
GENOTYPES
AA 1
Aa 2
aa 1
Ratio 1:2:1

11. First: Set up the Parental Cross P 1
. F =flying f = walking
P = purple p = orange
FFPP X ffpp
MALE FEMALE

12. PARENTAL P1 DIHYBRID CROSS

13. PARENTAL P1 DIHYBRID CROSS

14. . F =flying f = walking
P = purple p = orange
Do the F1 cross
FfPp X FfPp
Be sure you choose one of EACH type of allele

15. F2 DIHYBRID CROSS

16. F2 DIHYBRID CROSS

17. F2 DIHYBRID CROSS

18. F2 DIHYBRID CROSS

19. F2 DIHYBRID CROSS

20. F2 DIHYBRID CROSS

21. F2 DIHYBRID CROSS