click below
click below
Normal Size Small Size show me how
DNA and Chromosomes
Biology vocab
Term | Definition |
---|---|
Cell Cycle | The regular pattern of growth, DNA duplication, and cell division that occurs in eukaryotic cells |
Mitosis | The division of the cell nucleus and its contents |
Cytokinesis | is the process that divides the cell cytoplasm |
Chromosome | One continuous thread of DNA that consists of numerous genes along with regulatory information |
Histones | A group of proteins |
Chromatin | The loose combination of DNA and proteins |
Chromatid | One half of a duplicated chromosome |
Centromere | A region of the condensed chromosome that looks pinched |
Telomeres | Made of repeating nucleotides that do not form genes |
Prophase | Chromatin condenses into tighly coiled chromosomes |
Metaphasae | The spindle fibers attach to a protein structure on the centromere of each chromosome |
Somatic Cell | Body cells |
Gamete | Sex cells |
Homologous chromosomes | Two chromosomes |
autosomes | Chromosomes that contain genes |
sex chromosomes | That directly control the development of sexual characteristics |
Sexual Reproduction | Involves the fusion of two gametes that results in offspring that are a genetic mixture of both pairs |
Fertilization | The actual fusion of an egg and a sperm |
Diploid | A cell has two copies of a chromosome |
Haploid | A cell has one copy of a chromosome |
Meiosis | A form of nuclear division that divides a diploid cell into haploid cells |
Gametogenesis | The production of gametes |
Sperm | The male gamete |
Egg | The female gamete |
Polar Bodies | Cells with little more than DNA that are eventually broken down |
Bacteriophage | Takes over a bacterium`s genetic machinery and directs it to make more viruses |
Nucleotide | Small units that make up DNA |
Double Helix | Model in which two strands of DNA wind around each other like a twisted ladder |
Base pair rules | T always pairs with A and C always pairs with G |
Replication | The process by which DNA is copied during the cell cycle |
DNA polymerases | Bond the new nucleotides together |