BLUE EYES RIDDLE

Trending Tags

Feel free to use content on this page for your website or blog, we only ask that you reference content back to us. Use the following code to link this page:
Terms · Privacy · Contact
Riddles and Answers © 2023

Blue Eyes Riddle

Both of my parents have brown eyes, as do I. My brother and my wife have blue eyes. Using the simple brown-blue model (two genes; a brown gene dominates blue gene), what are the chances of my first child having blue eyes?
Hint: Given my brother's blue eyes, what are the odds on my pair of eye-color genes?
1 in 3.

Since my brother has blue eyes (bb), both of my parents carry one brown and one blue gene (Bb). The three possibilities for my genotype, equally likely, are BB, Bb, and bB. Thus, there is a 2/3 chance that I carry a blue gene.

If I carry a blue gene, there is a 50% chance I will pass it on to my first child (and, obviously, 0% if I carry two brown genes).
Since my child will certainly get a blue gene from my wife, my gene will determine the eye color.

Multiplying the probabilities of those two independent events, there is a chance of 1/2 x 2/3 = 1/3 of my passing on a blue gene.
Did you answer this riddle correctly?
YES  NO  

Add Your Riddle Here

Have some tricky riddles of your own? Leave them below for our users to try and solve.