This means that the fertilised egg often gets two pair of these bad genes on matching chromosomes, usually many such pairs of bad genes.
(This; means; that the fertilised egg often gets two pair of these bad genes on matching chromosomes) Context(This means,List([0, 10))):(the fertilised egg; gets; two pair of these bad genes on matching chromosomes; T:often)
This means,List([0, 10))
This the fertilised egg
means gets
that the fertilised egg often gets two pair of these bad genes on matching chromosomes
two pair of these bad genes on matching chromosomes T:often