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.
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.
The embryos with
a normal number of chromosomes are selected from the group for transfer.
An embryo that contains
a normal number of chromosomes is a «euploid» embryo.
But the whiptails» egg cells first double their chromosomes twice and then divide twice, leaving them with
the normal number of chromosomes and rendering a sperm cell unnecessary.
This increase in proliferation was not due to transformation in culture since karyotypic analysis of all iPS lines analyzed (iPS1 - 2) revealed
a normal number of chromosomes (46XX) without gross abnormalities (Figure 3C).