Flashcards
Meiosis
Cards in this deck (11)
- 1Definition of: MeiosisCell division that shuffles genes on the chromosomes so that all cells produced are genetically different. One diploid cell gives rise to four haploid cells.
- 2In meiosis the cells are genetically: The process is what type of reproduction? It produces: It occurs for what type of cells? What is its purpose for? How many divisions are there?Different
Sexual
4 different haploid cells
Gametes
Sexual reproduction
2 divisions - 3How do you calculate the number of possible chromosome combinations?2^n where n= number of pairs of homologous chromosomes.
In humans, n=23, therefore 2^23 = 8,000,000 combinations. - 4Definition of: GeneA length of DNA that codes for a polypeptide.
- 5Definition of: LocusThe position of a gene on a chromosome of DNA molecule.
- 6Definition of: AlleleOne of the different forms of a particular gene.
- 7Definition of: Homologous ChromosomesA pair of chromosomes, one maternal and one paternal, that have the same gene loci.
- 8Describe 'crossing over'.~Twisting of the chromatids occurs.
~Tension causes part of the chromatid to break off.
~The broken-off portions rejoin with the chromatids of the homologous partner.
~New combinations of genetic material are produced. - 9Describe the parent cell before meiosis occurs.Parent cell showing a single pair of homologous chromosomes.
- 10Describe what occurs in meiosis 1.Homologous chromosomes are separated into different cells.
- 11Describe what occurs in meioosis 2.Chromatids are separated by a further division into four cells each with a single chromatid.
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- AS level Biology (Genetic Diversity And Adaptation) Flashcards on Meiosis, created by Melissa O'Mahony on 12/03/2017.
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- Melissa O'Mahony
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