Bio Sat2 ch5
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- The general process for cell replication.
- The cell is replicating chromosomes but not actively dividing.
- Holds together 2 pieces of DNA in a chromosome.
- Holds together 2 chromatids.
- As a single strand the whole thing is a chromosome.
- Two former chromosomes, then form a chromosome, and they are referred to as chromatids.
- A chromosome is always the whole thing.
- The strands of a chromosome.
- There are 2 in a chromosome.
- The Centrioles move away from each other.
- The mitotic spindle is formed.
- The nuclear membrane fades.
- The fibers formed by the centrioles.
- They attach to the centromeres and pull the chromosomes apart.
The chromosomes line up at the metaphase plate.
The equator of the cell.
- The centromere is split in half and the chromatids are pulled apart to opposite poles.
- The cell begins to split at the cleavage furrow.
- The nuclear membranes form in the new cells.
- The cytoplasm divides during cytokinesis
The cytoplasm divides into 2 daughter cells.
The portions of chromosomes that are transcribed to mRNA.
A layout of all the chromosomes in an organism
- Sex cells
- ie: sperm and ova.
Non-sex body cells
Cells having 2 complete sets of chromosomes
Cells having only one set of chromosomes.
In humans, 46
In Humans, 23
The formation of gametes.
The ovum fertilized by the sperm
The chromosomes pairing up with their homologous partner in meisos, Prophase I.
- Thw Homologous pairs match up (Synapsis).
- Tetrad is formed.
- Crossing over happens.
The four chromatids in a homologous pair.
Segments of homologous chromomsomes are exchanged.
The homologous paris line up
The Homologous pairs are separated.
- The cells go through cytokinesis.
- The nuclear membranes reform.
- The new cells are considered haploid.
The same as mitosis, but results in four haploid cells.
The formation of sperm and ova.
- The formation of sperm.
- 4 haploid sperm are formed.
The diploid cell at the beginning of spermatogenesis.
The tubles on the testes where the Spermatagonium live.
- The formation of an ovum.
- One ovum is formed.
The egg, to be fertilized by sperm.
The diploid cell at the beginning of oogenesis.
- Two polar bodies are formed from oogenesis.
- they receive no cytoplasm or organelles, and then dicintegrate.
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