MeiosisImportanceGeneticDiversity

Meiosis Importance in genetic diversity

Definitions ,[object Object],[object Object]

Meiosis I ,[object Object],[object Object],[object Object],[object Object],[object Object]

Meiosis I ,[object Object],Nuclear membrane Chromosomes Cytoplasm Cell membrane

Meiosis I ,[object Object],Homologous chromosomes

Meiosis I ,[object Object],Male gamete Female gamete gene chromosome

Meiosis I ,[object Object],zygote Homologous chromosomes Genotype: AaRrBb

Meiosis I ,[object Object],Sister chromatids Light colored: maternal Dark colored: paternal

Meiosis I ,[object Object],Spindle fibers: responsible for pulling the chromosomes apart Crossing over: exchange of parts; configuration: tetrad

Meiosis I ,[object Object],[object Object],[object Object]

Meiosis I ,[object Object],[object Object],Spindle fiber pulling a chromosome

Meiosis I ,[object Object],[object Object],Sister chromatids p (petite) arm q arm

Meiosis II ,[object Object],[object Object],[object Object],[object Object]

Meiosis II ,[object Object],[object Object],[object Object],Used to be sister chromatids

Meiosis II ,[object Object],[object Object],[object Object],Light colored: maternal Dark colored: paternal

Independent assortment ,[object Object],1 1 2 3 4 5 6 7 8 9 10 2 3 1 3 4 5 6 7 8 9 10

Example If crossing over did not happen Contains dominant allele S (smooth skin form) Contains recessive allele s (wrinkled skin form)

Example Recessive allele s Zygote Skin form ss (wrinkled skin) If crossing over did not happen: Zygote Skin form Ss (smooth skin)

Fruit fly ( Drosophila melanogaster ) chromosomes

Empfohlen