Lisa and Dave just had a baby At least Lisa thinks Dave is t

Lisa and Dave just had a baby! At least Lisa thinks Dave is the father!
Lisa and Dave both have brown eyes and the baby is born with blue eyes. Dave claims that there is, \"no way\" that he is the father because he has brown eyes. Lisa says that he is and she will prove it! Before they end up on the Maury Povich show, Dave goes to visit his Grandmother and sees that she has blue eyes!   What does that mean about the chances of Dave being the father?

A.) Dave is totally right, no way could he have a blue-eyed kid!
B.) It means that Dave carries that blue-eye allele and Lisa does not.
C.) Nice of him to visit grandma, but that information doesn\'t help solve the question.
D.) It means that Dave could be carrying the blue eyed allele, since blue eyes are recessive -- he could actually be the dad.

Solution

answer is D ...color vision in human maily due to presence of OCA₂ and HERC2. among these two OCA₂ is main determinent for blue eyes. in above qustion only femles are getting blue eyes that means they are act as carrie for the gene. so there is possiblity for baby to be had blue eyes even though dave had brown eyes...this a heterozygous recessive pattern