Charissenicoleid
Answered

A cross was made between a pea plant that has the genotype (GgNn) and one that has the genotype (ggnn). What is the phenotypic ratio expected in this cross?

Sagot :

Shemmarzan470id
  • The phenotypic ratio will be:

4:4:4:4

To explain this:

  • First you have to establish your parental cross, or P1.

P1  ________________________X_________________________

  • Then the next step is to determine the genotypes of the two parents and then assign them letters to represent the alleles.

GgNn x ggnn

 

  • As you can see, the possible combinations of alleles are:  GN, gn, Gn and gN The possible combinations for the other are gn gn gn gn.

  • Align each combination of alleles for each parent along the side and top of the 16 squares.  Take the letters that correspond with each box and bring the letters into the boxes.

          GN           gn          Gn           gN

gn      GgNn       ggnn     Ggnn     ggNn

gn      GgNn       ggnn    Ggnn     ggNn

gn      GgNn       ggnn     Ggnn     ggNn

gn     GgNn       ggnn     Ggnn     ggNn

Genotypic ratio: 4:4:4:4

Phenotypic ratio: 4:4:4:4

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