KA6- Chromosome mutations Flashcards
1
Q
What do body cells have?
A
Two homologous sets of chromosomes
2
Q
What happens to chromosomes before mitosis occurs?
A
They need to be replicated
3
Q
When does a chromosome structure mutation occur?
A
When a whole section of a chromosome breaks and re-joins in different ways, which alters the number and sequence of genes
4
Q
What does deletion involve?
A
A chromosome breaking in two places and a portion of genetic material being lost
5
Q
What does translocation involve?
A
A section of one non-homologous chromosome breaking off and becoming attached to another chromosome
6
Q
What is duplication?
A
When genes are added to a chromosome from its homologous partner
7
Q
What is inversion?
A
When a section within a chromosome is turned upside down
8
Q
Are chromosomal mutations often lethal?
A
Yes
9
Q
A
