blue

Inbreeding results in homozygosity, which can increase the chances of offspring being affected by deleterious or recessive traits. This usually leads to at least temporarily decreased biological fitness of a population (called inbreeding depression), which is its ability to survive and reproduce.

First, the answer is yes to both questions: two blue-eyed parents can produce green or brown-eyed children. Eye color is not the simple decision between the brown (or green) and blue versions of a single gene.

Two brown-eyed parents are more likely to have a child with brown eyes. If one of the grandparents has blue eyes, the chances of having a blue-eyed baby increase slightly. If one parent has brown eyes and the other has blue eyes, eye color is more of a toss up.

Brown (and sometimes green) is considered dominant. So a brown-eyed person may carry both a brown version and a non-brown version of the gene, and either copy may be passed to his children. Two brown-eyed parents (if both are heterozygous) can have a blue-eyed baby.

We know that on average, we’re going to inherit 25% of our DNA from each grandparent – but we also know in reality that’s not what happens. We get more or less than exactly 25% from each person in a grandparent pair. It’s the total of the DNA of both grandparents that adds up to 50% for the couple.

To find where you get your 2 percent DNA, you will have to search back to about 5 or 6 generations. This would be your great 4x great-grandparents. To figure this out, you will need to use the 50% DNA inheritance rule.

Percent DNA Shared by Relationship

Dna cannot skip a generation but flaws in a parent’s testing scan can make it appear so. A flaw can make it appear that there is a false break in a person’s segment, which leaves the two segments too small to read as a match.

3% Ashkenazi, and I have a documented Jewish great-grandmother (6 generations back)….If I’m __% ______, how many generations back would my most recent ancestor have lived?