Okay, so i got a question about phenotype, and geneotype, and i dont know how to do it. The question is: Some trolls have one eye (EE, Ee) while others have two (ee). Two heterozygous one eyed trolls are crossed. What is the expected genotype ratio of the two eyed offspring?

= 25 %

Explanation:

Given that :

the genotype attributed to  trolls having one eye  = (EE, Ee);  that is homzygous dominant or heterozygote dominant for eye number

Likewise those that posses two eyes have (ee) ; that is homzygous recessive

Now; two heterozygous one eyed trolls are crossed ; we have :

Ee  × Ee

The punnet square for this cross looks like what we have below:

               E                e

E              EE              Ee

e              Ee               ee

From the above cross; we have:

1   EE    ---- (homozygous dominant ) indicating troll having one eye

2  Ee    ---- ( heterozygote dominant ) indicating troll having one eye

1  ee    ----- ( homozygous recessive ) indicating troll having two eyes

The genotypic ratio is 1:2:1

Thus; the expected genotype ratio of the two eyed offspring =

= 25 %  

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