Topoic Two Meiosis Flashcards
Binary fission
So parts reproduce and cell divides in half
Gametes
Sex cells divide to produce gametes
Spermatogenesis
Occurs in Testes
Oogenesis
Occurs in the ovaries
Homologous chromosomes
I made up of chromosome pairs of approximately the same length centromere position and staining pattern for genes
Meiosis one
Separates Homologous chromosomes
Interphase
DNA is replicated
Prophase 1
Synapsis and crossing over occur
Metaphase 1
Tetras lineup on the metaphase plate
Anaphase one
Homologous pairs separate
Telophase one
This is the first miotic cell division
Cytokonises one
Forms Two daughter cells
Meiosis two
Separates sister chromatids
Prophase two
Each of the daughter cells forms a spindle and double-stranded chromosomes move towards equator
Metaphase 2
Chromosomes line up on the metaphase plate
Telophase two
Nuclei form at opposite ends
Cytokines
Cells spilt into four
Genetic Diversity
When the genes and chromosomes are mixed up during cross over
Independent assortment
Individual chromosomes a sort independently during gamete production, giving different traits an equal opportunity of occurring together
Crossing over
Multiplies the already huge number of different gamine types produced by independent assortment
Fertilization
The fusion of sperm and egg to form a zygote
Zygote
A fertilized egg
Nondisjunction
Chromosomes fail separate
Monosony
Missing sex chromosome - occurs once in 2000 births
