when heterozygos parents produce offspring, what is the expected ratio of those offspring showing the dominant

Question

trait to the offspring showing the recessive trait?

and why is it impossible to predict exactly what trait any given individual offspring that results from a cross will have?

Answer 1

Crossing heterozygous parents, Rr x Rr, produces offspring that are expected to be in the ratio of 3 of the dominant phenotype to 1 of the recessive phenotype.

It's impossible to predict which trait a given individual will have because it's all just a matter of probability. It's a 3/4 chance that the individual would have the dominant form, and it's a 1/4 chance that the individual would have the recessive form.

Answer 2

75 % dominant 25% recessive

T t
-------
T Tt Tt
t Tt tt