Eye color is determined by a person's genes. If R represents the gene for brown eyes and I represent the gene for blue eyes answer the following:
Consider the offspring of a parent with a homozygous brown-eyed RR gene combination and a parent with a heterozygous brown-eyed RI gene combination. What percent of the possible genetic combinations result in brown-eyed offspring? What percent of the possible genetic combinations are carriers for the blue-eyed gene?
The color of a person's eyes depends on the genetic configuration. The gene responsible for brown eyes is denoted by R and that blue eyes is denoted by I.
A person with only the R gene has brown eyes. A person with both the R and the I gene has brown eyes if the R gene is dominant and blue eyes if the I gene is dominant.
The offspring of a parent with RR gene combination and another with RI gene combination can have the following gene combinations:
RR, RR, RI, IR
R RR RR
I IR RI
There is a 75% probability that the offspring has brown eyes. The probability that the offspring has blue eyes is 25%. The probability that the offspring is a carrier for the blue-eyed gene is 50%.