Errors in meiosis Flashcards
what is independent assortment
the process of the chromosomes moving randomly to opposite poles in meiosis
deletion
piece of the chromosome is lost
duplication
piece of chromosome is duplicated
inversion
piece of chromosome is reversed
translocation
piece of chromosome attaches to a different chromosome (outside of homologous pair)
What is it called when the sister chromatids do not separate properly
non disjunction
causes a cell with too many or too few chromosomes
(n-1 or n+1)
can happen in anaphase I or II
What happens if disjunction happens in anaphase I
2 cells get n+1
2 cells get n-1
What happens if disjunction occurs in anaphase II
! cell with n+1
1 cell with n-1
2 cells with n
Anauploidy
when abnormal gametes combine
monosomy
missing a copy of a chromosome
trisomy
extra copy of chromosome
sperm (n = 23) + egg (n + 1 = 24) = zygote (2n + 1 = 46 + 1
= 47) =
aneuploids
organism with abnormal numebr of chromosomes
how do you name the aneuploidy condition
trisomy/monosomy + the chromosome number affected
What causes cris du chat syndrome
deletion in chromosome 5
what does duplication in chromosome 17 cause
Charcot marie tooth disease
