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What is 1 + 3?
cell division in which chromosome number stays the same two cells produced from original cell
cell division in which chromosome number is cut in half and 4 cells produced rom the original cell
Stages of mitosis
division of cytoplasm
chromosomes fully condensed
nuclear membrane completely breaks up
centrioles migrate to opposite poles of the cell
spindle fibers form between poles
chromosomes attach to spindle fibers at centromeres
chromosomes align in the middle between 2 poles
sister chromatids separate and migrate to opposite poles
nuclear membrane forms around each set of chromosomes
spindle apparatus breaks up
section of DNA that codes for protein
alternate forms of chromosome that code for the same sets of proteins
alternative forms of a gene that codes for the same protein
genes that occur on the same chromosome
sister chromatids --> 2 copies of the same chromosome
homologs = 2 Dyads --> 4 chromosomes
dyads contact one another to form tetrad
points of connection between non-sister chromatids in tetrad
exchange of DNA between non-sister chromatids at Chiasmata
- Occurs at metaphase I
- Splitting occurs at Anaphase I
waiting phase, getting ready for second Meiosis
1. Segregation of Alleles
2. Independent assortment
genetic make up in diploid organisms
expressed i.e. "what it looks like"
homozygous recessive individual "aa".