What is the probability of a heterozygous brown eyed man and a blue eyed woman having a blue eyed child?
If both of you have brown eyes, then there is generally a 25% chance that the baby will have blue eyes if both of you carry the recessive blue-eye gene. But if only one of you has a recessive blue-eye gene, and the other has two brown, dominant genes, then there is a less than 1% chance of the baby having blue eyes.
What if two heterozygous people have kids what is the expected ratio of brown eyes to blue eyed kids?
1. If B is the allele for brown eyes and b is blue, the genotype of the blue-eyed man is bb. If he were heterozygous, we’d expect to see a 1:1 ratio of brown- and blue-eyed children (because his wife is homozygous recessive, bb).
Is blue eyes dominant or recessive?
The brown eye form of the eye color gene (or allele) is dominant, whereas the blue eye allele is recessive. If both parents have brown eyes yet carry the allele for blue eyes, a quarter of the children will have blue eyes, and three quarters will have brown eyes.
What is the probability of them having a heterozygous Blue eyed child?
The Punnet square below shows the probabilities for eye color in the offspring of two heterozygous (Bb) parents. If both parents are heterozygous for eye color, the probability that a child will have blue eyes is 14 or 0.25 , for each child, because each birth is an independent event.
How is it possible for a child to have blue eyes if both the mother and father have brown eyes?
Two Copies of Each Gene We get one copy from our mom and one copy from our dad. This is why it makes sense that brown-eyed parents might have a blue-eyed child. Remember that different versions of genes can be dominant or recessive.
Are brown eyes dominant over blue?
Eye color was traditionally described as a single gene trait, with brown eyes being dominant over blue eyes. Today, scientists have discovered that at least eight genes influence the final color of eyes. The genes control the amount of melanin inside specialized cells of the iris.
Can a baby have blue eyes if one parent has brown?
If one of the grandparents has blue eyes, the odds of having a baby with blue eyes increases slightly. If one parent has brown eyes and the other has blue eyes, the chances of having a brown-eyed or blue-eyed baby are roughly even.