chromosome/block mutations Flashcards
1
Q
what are chromosome/block mutations?
A
large scale mutations occurring during meiosis
- involves rearrangement of whole blocks of genes
2
Q
what is deletion in chromosome mutations?
A
break at two points and segment falls out and two ends join to form chromosomes deficient of some genes
3
Q
what is inversion in chromosome mutations?
A
a middle piece of the chromosome falls out and rotates 180 degrees then rejoins
- no loss of genetic material
- genes are in reverse order
4
Q
what are the 4 types of mutations in chromosome mutation?
A
deletion
inversion
translocation
duplication
5
Q
what is translocation in chromosome mutations?
A
movement of a group of genes between different chromosomes
6
Q
what is duplication in chromosome mutations?
A
a segment is lost from one chromosome and is added to its homologous
7
Q
what is nondisjunction?
A
- chromosome mutation
- results in incorrect dividing up of chromosomes to the gametes
- during anaphase of meiosis
= down syndrome
