A normal human has 23 pairs of chromosomes, i.e. 64 chromosomes. People with Downes Syndrome have an extra copy of the 21st chromosome so they have 65 chromosomes.
16If there are 8 chromosomes in a gamete (haploid sex cell) then after fertilization there should be 16 chromosomes after fertilization (given that both gamete cells are normal).Both gametes (either...