Constitution of the United States of America (1787). Download PDF of the Constitution. The Constitution was written in the summer of 1787 in Philadelphia, Pennsylvania, by delegates from 12 states, in order to replace the Articles of Confederation with a new form of government.
Gametes have a haploid number (23). When conception occurs, a human sperm and ovum combine their chromosomes to make a zygote (fertilized egg) with 46 chromosomes. This is the same number that the parents each had in their somatic cells. In doing this, nature is acting conservatively. Each generation inherits the same number of chromosomes.
Some writers often refer to the moment of conception or instant of conception.. Actually, conception is a process that extends over hours. Half of the zygote's 46 chromosomes come from the egg's 23 chromosomes and the other half from the spermatozoon's 23. The result is a unique human DNA structure, different from both that of the ovum's and the spermatozoon's DNA.