Meiosis Flashcards
Define Chance: (stats)
The occurrence of events in the absence of any obvious cause.
Define Continuous variation:
Variation in which organisms do not fall into distinct categories but show gradations from one extreme to the other.
Define Crossing over:
The process whereby a chromatid breaks during meiosis and rejoins to the chromatid of its homologous chromosome so that their alleles are exchanged.
Define Diploid:
A term applied to cell in which the nucleus contains two sets of chromosomes.
Define Discontinuous variation:
Variation in which organisms fall into distinct categories.
Define Fertilisation:
The fusion of two gametes, bringing together the DNA from each.
Define Gamete:
The reproductive cell that fuses with another gamete during fertilisation.
Define Genetic variation:
Differences in DNA base sequence between two or more organisms, with the possibility of resulting in different alleles.
Define Haploid:
Term referring to cells that contain only a single copy of each chromosome.
Define Homologous chromosomes:
A pair of chromosomes , one maternal and one paternal, that have the same gene loci and therefore determine the same features.
Give an example of a gamete (human):
Human egg or sperm.
What type of cell is a gamete such as a sperm cell.?
Haploid.
Give an example of a haploid cell:
Gametes such as Sperm or Egg cells.
Define Independant segregation:
The process by which maternal and paternal copies of homologous are randomly distributed to gametes during meiosis.
Define Meiosis:
The type of nuclear division in which the number of chromosomes is halved.
