Both parents have brown/blue pair of eye color genes, and eachparent contributes

Question

Both parents have brown/blue pair of eye color genes, and eachparent contributes one gene to a child. Assume that if the childhas at least one brown gene, that color will dominate and the eyecolor will be brown. (The actual determination of eye color issomewhat more complicated)
a) List the different possible outcomes. Assume that these outcomesare equally likely.
b) What is the probability that a child of these parents will havethe blue/blue pair of genes?
c) What is the probability that the child will have brown eyes?

Explanation / Answer

Lets denote B as the brown allele (gene) and b as the blueallele. The possible outcomes are.... a) BB=brown eyes Bb=brown eyes bB=brown eyes bb=blue eyes with each outcome occuring 25% of the time. b)P(bb)=.25 (25%) c)P(Brown)=.25+.25+.25=.75, or 75%

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