Monohybrid Inheritance

[Liv77]

In human beings the gene for brown eyes is dominant over the gene for blue eyes. A brown-eyed man marries a blue-eyed woman and they have five children. Three of the children have brown eyes and two have blue eyes.

What are the genotypes of the mother, the father, and the children? Explain how you arrive at your answer.

[kvalidir]

http://www.biologycorner.com/worksheets/genetics_eye_color.html

That explains most of what you need to know-d you can easily do the work yourself from the information, but just t confuse you both of my parents have bright blue eyes and I was born was black/ brown eyes.

[Peter Pedant]

the genotype of the mother must be bl/bl
your answer should explain why this must be so ( cos anything else would not be blue eyed)

the fathers genotype could be br/br OR br/bl
because both genotypes give the same phenotype - brown eyes

then do a mother meets father type diagram with four kids
representing all the possible combinations

you need two diagrams because the fathers genotype has two possibilities

and then you will see with one of the diagrams it is not possible to get blue eyed children and so the genotype has to be second one
where the mother is homozygous for blue and the father is heterosygous

Not bad for a biology question

I always found genetics interesting

[Peter Pedant]

I see Kvalz answer is ticked as the best answer

It certainly is the most astounding answer

[kvalidir]

Why is it astounding Peter???If you are one of the people who think two blue eye parents can't produce a brown eyed child, then you are guilty of the over simplification of genetics. This link will explain it for you:-

http://genetics.thetech.org/how-blue-eyed-parents-can-have-brown-eyed-children