Best Answer: Your genotype determines your blood type before your born. There are three alleles or versions of the blood type gene: A, B, and O. Since everybody has two copies of these genes, there are six possible combinations; AA, BB, OO, AB, AO, and BO.h is not passed down from parents. With your parents having AB and O, you can only have type A or type B blood because O is recessive. You could have type O if your mother was AO or BO, but she isn't. Since you have type A, your blood is AO (A from your mother and O from your father... but A is dominant).
Rating Newest Oldest. Best Answer: Officially, the third week of September when Fall starts all over the U.S at the autumnal equinox - this year it is September 22nd. And you can find this answer easily through many other methods, like simply googling when does fall start.. You'd be surprised how google search can answer questions.
Spring and autumn begin on the equinoxes, the instant when the sun passes either north or south over the equator. When the sun is directly on the equator and the tilt of the earth's axis is neither away from or towards the sun, day and night are approximately equal in length. These moments or instants don't happen at exactly the same time every year, but in autumn are usually in and around the 22 or 23 September.