Yes, because your great granny is his granny.
if second cousins once removed have children together, will the children have genetic problems
inbreeding= the act of of mating genetically within the same genetic pool (close relations) Mating with 1st cousins does contribute to inbreeding and can be OK but often presents genetic problems, which is far less likely with 2nd cousins to the point where it is basically OK to marry a 2nd cousin. Some 1st cousins can and do marry and everything is fine, especially with genetic testing prior to having kids. In many small towns throughout history cousins tended to end up married here and there- the worst problems come from repeated marrying of 1st cousins over and over within a small community or family. This has affected royal families since they could only marry other royals- at times anemia, retardation, and genetic diseases have plagued royal families until they realized the need to bring in some new blood.
Down's Syndrome
No, the children may have genetic defects.
Yes. The risks are overrated. Genetic defects create problems if the families have been intermarrying for many generations. One single generation of cousins marrying don't have a high risk of genetic defects. Many Muslim communities marry their first cousins. Because they have been doing so for many generations, they are at higher risks for genetic disorders. The Royal families of Europe have been intermarrying for generations. That creates risks. But a one off case of cousins marrying and having kids is not high on the risk charts. The social rules that frown on cousins marrying are to avoid genetic disorders if the trend went on for many generations. Not so for a single generation.
It depends on how close a relative. It is legal to marry and have children with cousins however anyone closer related it is illegal to marry or have children and the children will potentially have genetic problems
First cousins can marry in many places because they are considered to have a close enough blood relationship that potential genetic risks or abnormalities can be assessed before marriage. However, second cousins have a more distant blood relationship, and the risk of genetic disorders decreases significantly, which is why they are generally allowed to marry.
Genetic crossover occurs, which causes a sharing and transference of genetic information between maternal and paternal copies of chromosomes and further enhances the genetic variability of their offspring.
Recombination is the genetic mixing of genes that result from crossing over.
breast cancer is more prevalent in females who had a close relative (mother, sister, maternal aunt, or maternal grandmother) with previous breast cancer.
No. Except for identical twins, the genetic makeup of each person is different. However, the more closely related you are to someone, the more similar your genetic makeup. So the genetics of siblings is more similar than of first cousins.
It will depend on the laws in your jurisdiction. There are many places where first cousins can legally marry. Some that allow that will only do so if they cannot have children. Others will allow them to have children and don't believe there will be an issue with any genetic problems.