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Topic 4

Meosis

TermDefinition
What does meosis produce Meosis produces cells that are genetically different from eachother
What does meosis involve It involves 2 nuclear divisions and creates 4 haploid daughter cells from a single parent cell
How is variation introduced in meosis This is introduced through Independent segregation of homologous chromosomes Crossing over of homologous chromosomes
What happens in meosis 1 Homologous pairs of chromosomes line up opposite eachother at the equator of the cell The pairs are seperated so one of homologous pair ends up in the daughter cell
What does independent segregation do This leads to a large number of possible combinations of chromosomes in daughter cells produced
How does crossing over occur Once homologous pair of chromosomes lined up opposite eachother they can become twisted around eachother
How do new combinations of alleles occur These happen as once chromatids twisted this puts tension on chromatids and they break Broken parts recombine with another chromatid Forms new combinations of alleles
Meosis Meosis 2 nuclear divisions Haploid cell Introduces genetic variation
Mitosis Mitosis one nuclear division Diploid cells Create genetically identical cells
Whats another thing which can increase genetic varitation Random fertilisation It is random which egg and sperm will fuse in fertilisation Therefore variation will increase
Created by: yHya
 



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