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Meiosis and Variation
Variation is the sum of differences between species and within species. Intraspecific
variation is variation within a species. There are two form of variation in phenotypic
features:

In continuous variation there is a range of variation between extremes (i.e. Mass,
height, etc.) The appearance of the phenotype…

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Anaphase I ­ Chromosomes are pulled towards the poles by the shortening of the
microtubules.

Telophase I ­ Chromosomes reach opposite poles; nuclear membrane reforms to make
two haploid daughter cells; Cytokinesis occurs.

Meiosis II

Prophase II ­ Centrioles replicate and move to opposite poles; Nuclear membrane breaks
up.

Metaphase…

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observed and expected results. x2 = (OE
-E)
where E = expected value and O =

observed value

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