ANA SAYFA


MONOHYBRID AND DIHYBRID CROSSES PUNNETT SQUARE
 
 
 
*Punnet square:
 
→Punnet square is a graphical method that shows all the possible combinations of different types genotypes
    in crosses.
 
 
 
**Monohybrid cross punnett square:
  
 
Genotypes ratio: 1 : 2 : 1
 
Phenotypes ratio: 3 : 1 
 
 
 
→First, write all the possible combinations of different types of gametes on the punnett square.
 
 
 
 
→Then, cross the gametes on the punnett square.
 
 
 
 
 
**Dihybrid crosses punnett square:
 
 
              AaBb x AaBb
 
 
→First, write all the possible combinations of different types of gametes on the punnett square.
 
 
 
 
→Then, cross the gametes on the punnett square.
 
 
 
Phenotypes ratio: 9 : 3 : 3 : 1 
 
 
9 AB phenotype
 
3 Ab phenotype
 
3 aB phenotype
 
1 ab phenotype
 
 
 
 
 
 
 
 
 
 
 
 
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