3.4.3-Genetic Diversity Can Arise As A Result Of Mutation Or During Meiosis Flashcards
(10 cards)
What are gene mutations?
A change in the base sequence of chromosomes
Including base substitution and base deletion
Do all base substitutions cause a change in the amino acid sequence and why?
No due to the degenerate nature of the genetic code
Define the term mutagenic agent
A factor that increases the rate of mutations
State 4 mutagenic agents that can increase the rate of gene mutation
UV light
Ionising radiation
Certain chemicals
Certain viruses
What is a substitation mutation?
The replacement of one base by another base
What is a deleted mutation?
Deleted base(s)
What is an addition mutation?
Inserted base(s)
What is a duplication mutation?
Base(s) repeated
What is an inverse mutation?
Reversal of a sequence of bases
How many divisions are there in meiosis and what does meiosis produce?
Two divisions
Produces genetically different daughter cells
Usually four cells produced
