The following statement about sex determination is correct: A. Human sex determination is only related to sex chromosomes, not genes. B.a man can have two.

Analysis of test questions: A, female sex chromosomes are X and X, male sex chromosomes are X and Y, eggs produced by women only contain X, and sperm produced by men contain X or Y genes. When the fertilized egg combined with egg x and sperm y is XY, the fertilized egg develops into a boy; When the fertilized egg combined with egg X and sperm X is XX, the fertilized egg develops into a girl. It can be seen that human sex depends on sex chromosomes. However, in recent years, it has been found that there is a section of DNA (that is, gene) on Y chromosome related to the determination of male sex, and there are also genes related to female sex on X chromosome.

B, because there are many genes in human somatic cells, many different genotypes of sperm will be produced when sperm is produced. For example, when spermatogonia with AaBb genotype form sperm, they can form ab, aB, Ab, Ab and AB by randomly combining paired genes.

C, sex chromosome inheritance way is as follows:

It can be seen that one sex chromosome in human cells comes from the father and the other from the mother.

D, through the genetic pathway of sex chromosomes

It can be seen that fertilized eggs are formed at the earliest time when human sex is determined.