That's a good question. The short answer is that the embryo would not be viable.
Here's the background. We each have 23 pairs of chromosomes. We get 23 from Mom and 23 from Dad. When a human makes a gamete (egg or sperm), a cell with 23 PAIRS of chromosomes divides TWICE instead of the usual once. So an egg or sperm cell has 23 chromosomes (not 23 pairs). This special division is called meiosis (MY o sis).
Sometimes a problem will happen in meiosis. That results in an egg or sperm with an extra chromosome, or missing a chromosome. If that gamete becomes part of a new embryo, the embryo will be missing a chromosome or have an extra one.
Usually, an embryo that is missing a chromosome will not develop long enough to be born. The exception is individuals who only have one X chromosome (X0 instead of being XX or XY).
An embryo that has an extra chromosome may or may not be viable. Having an extra chromosome #21 is what causes Down Syndrome (its technical name is trisomy 21). Some individuals have an extra X or Y chromosome. They may not even know it. Most other cases where a person has an extra chromosome may lead to a miscarriage or death soon after birth. So if you imagine an embryo getting an extra chromosome for all 23, I can't imagine that it would be viable.
Because of the need to limit fertilization to one sperm, the egg throws up a barrier as soon as one sperm cell contacts it. It is like a very thick coating of gelatin that forms immediately. This prevents a second sperm from entering the egg.
Which parent do you think provides more genetic information to the embryo? Is it the same? Do they provide different types of information?
You might be interested in a career in genetics or developmental biology.
Thanks for asking,