Meiosis and Mitosis Flashcards
Meiosis 1 - Summary
It is a reduction division and involves the split of homologous pairs.
What does the indefinite shuffling of genes do?
Helps to create variation.
Chromosome assortment in metaphase is what?
Independent of each other and-so is random and contributes to variation.
What happens in Prophase 1 of Meiosis:
Homologous pairs form synapsis / bivalent. The homologous chromosomes crossover at the chiasma (sing-) and exchange genetic material, forming recombinant chromatids.
Some species skip telophase 1 and experience cytokinesis 1. What is formed when these steps are skipped?
Haploid Sister Chromatids.
Anaphase 2 of Meiosis:
the split of Recombinant Chromatids.
Anaphase 2 of Meiosis:
the split of Recombinant Chromatids.
What causes variation in Meiosis:
Formation of chiasmata and gene exchange (Prophase 1)and independent assortment (in Metaphase 1 & 2)
What is the role of Mitosis?
The asexual reproduction of genetically identical cells for the growth/ repair of tissues.
G1, G2, and S are processes that occur during interphase. TRUE OR FALSE.
FALSE, they are phases.
Meiosis II summary:
Separation of the sister chromatids.
In-depth prophase mitosis:
Chromatin fibres condense and coil to form chromosomes. Nucleolus disappears. Microtubules form spindle fibres. Centrioles migrate to both poles. Spindle fibers attach to centrosomes and nuclear envelope disappears.
