okay now to find the probability of you being born with Blond hair lets cross the BB parent with the bb parent.
Make a punnet square which looks like this (usually with lines)
B b
b
b
now to do a punnet square there are four spots, you drop each letter down and each letter across
B b
b Bb bb
b Bb bb
What this means is there are 4 spaces (4 possibilities) 2 out of 4 will be Bb (Brown hair but carriers for the blonde) and 2 out of 4 will be bb (blonde hair)
The probability of being blonde is 2/4 with those types of parents... which simplifies to 1/2. We're not done, lets do the eye color.
We said one parent is bb again and one parent is Bb again.... same results as the last punnet square above.... results would be 2/4 probability of being blonde with those types of parents and this simplifies again to 1/2.
Now heres where the probability math kicks in. You have a 1/2 chance of being blonde, and 1/2 chance of being blue eyed. To get the probability of being blonde AND blue eyed we need to multiply the two probabilities
1/2*1/2 = 1/4 ... see, easy
so this is your full answer is,.........
The odds are slim to be blue eyed and blonde because both of these traits are recessive. This means that I must have both recessive alleles in order to show these phenotypes (phenotypes is a fancy word for traits). Furthermore, (and this will impress him because you can explain your answer!) My parents are blonde haired blue eyed and the other is brown hair brown eyed. My one parent must have both recessive traits for the blonde hair and blue eyes and my other parent must have both the dominant and recessive traits for the blonde hair and blue eyes in order for me to be blonde hair blue eyes. The probability of my blonde parent (bb) and Brown haired parent (Bb) creating me with blonde hair is 1/2. The probability of my blue eyed parent (bb) and Brown eyed parent (Bb) creating me with blue eyes is also 1/2. When multiplied, the probability of my parents creating me as blonde haired and blue eyed is 1/4. There is only a 25% chance I would end up both blond haired and blue eyed.