meiotic disturbances Flashcards
1
Q
what is non disjunction?
A
a meiotic disturbance. failure to separate during meiosis. causes aneuploidy, which is abnormal number of chromosomes.
2
Q
trisomy
A
47 chromosomes
3
Q
monosomy
A
45 chromosomes
4
Q
when can aneuploidy happen?
A
during first or second meiotic division
5
Q
trisomy 21
A
down syndrome
6
Q
translocation or deletion
A
meiotic disturbance: part of chromosome can be translocated or deleted during meiosis
7
Q
polyploidy
A
meiotic disturbance; simultaneous fertilization by 2 spermatozoa (69 chromosomes)
failure of the second polar body to separate from the oocyte during 2nd meiotic division
