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Glencoe Life Science Chapter 4 - Cell Reproduction
Unit 1 (Life Structure & Function) of 7th Grade Science Chapter 4 - Reproduction of Organisms
Terms in this set (24)
A series of events from one cell division to the next
The phase where most of the life of a eukaryotic cell spends its life, this is a period of growth and development
A series of four phases or steps. The process in which the nucleus divides to form two identical nuclei. Each new nucleus formed has the same number and type of chromosomes.
A structure in the nucleus that contains hereditary material
The pairs of chromatids are fully visible when viewed under a microscope. The nucleus and the nuclear membrane disintegrate. Centrioles move to opposite ends of the cell. Spindle fibers begin to stretch across the cell.
Pairs of chromatids line up across the center of the cell. The centromere of each pair usually becomes attached to two spindle fibers, one from each side of the cell.
Each centromere divides and the spindle fibers shorten. Each pair of chromatids separates and chromatids begin to move to opposite ends of the cell. The separated chromatids are now called chromosomes.
Spindle fibers start to disappear, the chromosomes start to uncoil, and two new nuclei form.
A new organism is produced from one organism. There are three forms...
One celled bacterium without a nucleus copies its genetic material and then divides into two identical organisms
A new organism grows from the body of the parent organism made possible because of mitosis and cell division
The process that uses mitosis and cell division to regrow body parts
Two sex cells come together
The sex cell made in the male reproductive organs
The sex cell formed in the female reproductive organs
The joining of the egg and sperm. Mitosis and cell division will begin.
The cell that forms during fertilization
When cells have pairs of similar chromosomes. Theses cells far outnumber the other kind of cells in our bodies. These cells have 46 chromosomes.
These cells only have half of the number of chromosomes. These cells have 23 chromosomes.
This process produces haploid sex cells
A chemical that carries the hereditary code. Each side is made up of sugar-phosphate molecules, and the rungs are made up of nitrogen bases. When this is copied the new is identical to the original.
Hold the instructions for making a specific protein
A nucleic acid that carries to code from the nucleus to the ribosomes - there are three types: messenger, ribosomal, transfer
Any permanent change in the DNA sequence of a gene or chromosome of a cell
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