The phrase "normal number of chromosomes" means that a person or organism has the typical or expected amount of chromosomes in their cells. Full definition
Theoretically, only transfer back the embryos that have a normal number of chromosomes. (kidsinthehouse.com)
This technique requires that we freeze the embryos while we wait for testing results (this may take up to 2 weeks) we can use to determine which embryo has a normal number of chromosomes. (vcrmed.com)
The embryos with a normal number of chromosomes are selected from the group for transfer. (pacificfertilitycenter.com)