The link above will take you to the second website we visited in class today. There you can find practice terms and revisit how to make and read a karyotype.
Just think of the way you would match up your socks when folding laundry. You wouldn't pair the ankle sock with a tube sock. Nor would you match a pink ankle sock with a white one. Socks are matched by length and pattern just like chromosomes are matched by length and banding patterns.
Once the karyotype is arranged, then we make sure all the chromosome are normal:
1. Correct length
2. Correct banding pattern
3. Correct # of chromosomes in each pair (none missing and no extra)
If any of these characteristics aren't met, then they seek to diagnose the disorder.
Basically it boils down to Goldilocks again! Too much information = problem. Too little information = problem.
When meiosis goes wrong, the zygote's chromosomal make-up will suffer!