Shorthand formula of blood group inheritance law

Parents a and a, the child may be a or o;

Parents a and b, the child may be AB or a or b;

Parents b and b, the child may be b or o;

Parents a and o, the child may be a or o;

Parents b and o, the child may be b or o;

Parents AB and AB, the child may be a or b or ab;

Parents AB and o, the child may be a or b;

Parents o and o, the child must be o.

In a word, A and B are the bosses, appearing as overlords, and O shows off his power alone.

Extended data

Generally speaking, the blood type remains unchanged for life. People's blood types are usually divided into four types: A, B, O and AB, and the inheritance of blood types depends on chromosomes in cells. There are 23 pairs of chromosomes in human cells, and each pair of chromosomes consists of two single chromosomes, one from the father and the other from the mother.

The main component of chromosome is deoxyribonucleic acid, which determines genetic traits and functions, that is, DNA, which people often say. DNA can be divided into many small segments, each of which has specific genetic characteristics and functions. These small fragments are called genes. A small piece of DNA in the same position on two single chromosomes in a pair of chromosomes is called allele.

The gene locus of ABO blood group system is on chromosome 9, and human ABO blood group is controlled by three genes: A, B and O. However, there are only two ABO system genes on chromosome 9 of each human cell, which are a pair of alleles among AO, AA, BO, BB, AB and OO, in which A and B genes are dominant genes and O gene is recessive.

Baidu Encyclopedia-Table of Blood Group Inheritance Rules