Lecture 3 Flashcards
1
Q
what happens in meiosis 1
A
crossing over and segregation
maternal and paternal homologs pair up
chromosomes pulled to separate poles
2
Q
what happens in meiosis 2
A
chromatids pulled to separate poles
3
Q
what complex facilitates homologous pairing of chromosomes
A
synaptonemal complex
it aligns the chromosomes ready for anaphase
allows for genetic recombination
4
Q
how many crossings over are there in meiosis
A
at least one but never more than 4
5
Q
what is aneuploidy
A
monosomy - 1 copy of chromosome
trisomy - 3 copies of chromosome
caused by non disjunction
