click below
click below
Normal Size Small Size show me how
Bio-Reproduction
Meiosis, asexual and sexual reproduction
Term | Definition |
---|---|
asexual reproduction | an organism producing a genetically identical copy of itself, no mate |
sexual reproduction | an egg and a sperm combine from 2 parents to create a genetic variation of themselves, joining of gametes |
budding, process | the nucleus and cytoplasm grow and then divide into 2 cells of unequal size, the bud is an extension of the parent, the bud pinches off and becomes a new individual |
regeneration, process | organism can develop lost body parts or form a new individual from a fragment (starfish) |
spores | tiny cells used to create gametes |
vegetative propagation | parent plant uses runners to produce identical plants, new plant becomes an individual |
binary fission, process | circular chromosome duplicates and attaches to the cell membrane, a new membrane forms, b/c chromosomes are forced apart, membrane constricts and 2 cells are formed |
haploid | half of the normal amount of chromosomes, humans 23, one set of chromosomes |
diploid | normal amount of chromosomes, humans 46, two sets of homologous chromosomes |
crossing over | exchange of corresponding DNA segments between non sister chromatids, the homologous chromosomes trade equal amounts of DNA |
chiasma | site of tetrad attachment and site where chromosomes cross over |
homologous chromosomes | chromosomes with the same length, centromere position, and gene location, sister chromatids from each parent, chromosomes that have the same information |
locus | the position of a gene |
gamete | sperm and egg cells, reproductive cells, cells with a haploid number of chromosomes |
somatic cell | cells with 23 pairs of homologous chromosomes, every other cell besides a gamete |
zygote | diploid cell, 23 chromosomes from each parent, cell that forms from an egg and sperm combination, 1st cell of a living organism |
polar body | small egg cell that is not taken care of and dies |
nondisjunction | failure of chromosomes of chromatids to separate normally during meiosis |