Mitosis Essay

(ii) Independent/random assortment OR description of independent assortment NOT chromosome shufflingcrossing overrecombination OR description of recombination for example linked genes separated/genetic information exchangednon-disjunction/description NOT spindle failure aloneMax 3 (from 4)Total10

1 gamete mother cells (undergo meiosis)spindle forms OR nuclear membrane breaks downhomologous chromosomes pairhomologous chromosomes line up at equator/middle of cellOR crossing over occurs at chiasmatahomologous chromosomes segregate/move apartOR independent assortment occursCytoplasm splits/new nuclear membranes formtwo haploid cells/cells with one set of chromosomes/cells with half the number of chromosomes formMax 4 (from 7)two new spindles form (where candidate has scored both points 2 and 8, award mark only once in candidate‟s favour)chromosomes line up on equator/middle of cellchromatids separate/are pulled apartcytoplasm splits/new nuclear membranes form (where candidate has scored both points 6 and 11, award mark only once in candidate‟s favour)to give four haploid cells or four gametesMax 3 (from 5)Max 7 (from 10)

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