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Powerpoint Presentation: Meiosis

 

Genetics Index

Chromosomes
Meiosis: Crossing over
Mitosis and Meiosis
Introduction to Mendelian Genetics
Test Cross
Codominance
Multiple Alleles
Pedigree Charts
Twin Studies
The dihybrid cross
Dihybrid Cross : Test Cross
Autosomal Linkage
The Genetic Diagram for Linked Genes
Calculating the cross over value using a test cross
Sex determination and sex linkage
Sex linkage
Genetic diagram for sex linked genes
Blood Clotting and Haemophilia
The Retina and Daltonism
Genetic Modification
Cloning Animals
Cloning Plants

Topic Chapters Index

 

Meiosis performs two functions

  • It halves the number of chromosomes to make haploid sets

  • It shuffles the genes to produce new combinations (recombinations)

 

Meiosis and sexual reproduction

  • Meiosis is needed to produce sex cells (gametes) with unpaired sets of chromosomes (haploid)

  • Sex cells are used in fertilisation

  • At fertilisation two sets of genes come together to form a hybrid with a set of paired chromosomes (diploid)

  • The hybrid, whilst similar to the parents, is unique

 

 

GENETICS

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Meiosis

The great gene shuffling machine

 

Haploid and Diploid

  • Karyotypes of somatic cells show paired sets of chromosomes

  • The origin of the pairs are the maternal and paternal chromosomes of the egg and the sperm

  • The number of types of chromosomes of a species is constant = n

  • So the diploid (paired set) = 2n

 

The sexual reproduction life cycle

life cycle

Meiosis a two step process

  • Meiosis 1 is the reduction division

  • Meiosis 2 resembles mitosis

 

Meiosis 1

Meiosis 1

Meiosis 1

Meiosis 1

 

Meiosis 2

Meiosis 2

Meiosis 2

Meiosis 2

 

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