A fish is homozygous dominant for bug eyes and his mate is heterozygous. show the possible offspring.
i have BB BB Bb and Bb for the possible offspring, but how do I express this phenotypic ratio?
would 4:0 correct?
Yes. See http://library.thinkquest.org/20830/Textbook/Genetics.htm
I hope this helps. Thanks for asking.
To determine the phenotypic ratio of the possible offspring, you need to consider the expression of the dominant and recessive traits. In this case, the dominant trait is bug eyes (BB), while the recessive trait is the absence of bug eyes (bb).
Given that the fish is homozygous dominant for bug eyes (BB) and its mate is heterozygous (Bb), the possible genotypes of the offspring are:
Offspring 1: BB (homozygous dominant)
Offspring 2: BB (homozygous dominant)
Offspring 3: Bb (heterozygous)
Offspring 4: Bb (heterozygous)
Now let's express the phenotypic ratio. Since bug eyes are the dominant trait, any offspring that carries at least one dominant allele (B) will have bug eyes. Thus, all the offspring (Offspring 1-4) will have bug eyes. Therefore, the phenotypic ratio of this cross would be expressed as 4:0, which indicates that all the offspring will exhibit the bug eyes phenotype.