00:01
Which of these is representative of the fertilisation process for monozygotic twins.
00:08
A, one egg, fertilised by two sperm.
00:11
B, one egg splits, then fertilised by two sperm.
00:15
C, one egg fertilised by one sperm, then splits.
00:19
Or d, two eggs fertilised by the same sperm.
00:24
So, monozygotic, as the name suggests, there is one zygote.
00:28
Another name for these are identical twins.
00:31
So looking at these, let's roll out a and d first, because in both cases, the maths doesn't just add up on how many chromosomes the individuals would have.
00:42
For example, one egg fertilised by two different sperm, that has too many copies of each chromosome.
00:48
That would not be viable in any way...