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Topic 4

Meosis Chromosome mutations

How can mutations arise These can arise by chromosome non disjunction during meosis
What is a non disjunction This is when the chromosomes or chromatids do not split equally during anaphase
Non disjunction can occur in 2 forms Changes in whole sets of chromosomes (polypoidy) Changes in the individual number of chromosomes (Aneuploidy)
What does polypoidy mean This means that changes in whole sets of chromosomes occur when organisms have 3 or more sets of chromosomes rather than 2 This usally occurs in plants
What does it mean by Aneuploidy Sometimes individual homologous pairs of chromosomes fail to seperatae during meosis This results in gamete having one more or fewer chromosme
On fertilisation with a gamete that has the normal number of chromosomes the reultant zygote will have more or fewer chromosomes than normal in all their body cells
Created by: yHya
 

 



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