Question:
how to write genotype ratio and phenotype ratio
Answer:
The genotypic ratio refers to the different combinations obtained from a Punnett Square cross. Based on the results provided, the image below presents a possible Punnett Square cross:
Dominant and recessive (T = Tall and t = short)
Cross Tt x Tt
|
|
T |
t |
|
T |
TT |
Tt |
|
t |
Tt |
tt |
Genotypic ratio 1 : 2 : 1 (TT , Tf, tt)
However, people with the genotype TT and Tt would display the same phenotype, as T is the dominant gene that is expressed. Thus, people who express the F gene represent 3/4 of the total people from your cross, with 1/4 of the people expressing the t gene. The phenotypic ratio is then 3:1.
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