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Holt chap 7 sect 1

Polar Bear Book Meiosis

TermDefinition
meiosis a process in cell division during which the number of chromosomes decreases to half the original number by two divisions of the nucleus, produces gametes
crossing-over the exchange genetic material between homologous chromosomes during meiosis; can result in genetic recombination
independent assortment the random distribution of the pairs of genes on different chromosomes to the gametes
spermatogenesis the process by which male gametes form
sperm the male gamete
oogenesis the production, growth, and maturation of an ovum
ovum a mature egg cell
prophase I The first phase of meiosis; chromosomes become visible. The nuclear envelope breaks down. crossing-over occurs
metaphase I The second phase of meiosis; pairs of homologous chromosomes move to the equator of the cell.
anaphase I The third phase of meiosis; homologous chromosomes move to the opposite poles of the cell.
telophase I The fourth phase of meiosis; chromosomes gather at the poles of the cell.
prophase II A new spindle forms around the chromosomes.
metaphase II Chromosomes line-up at the equator.
anaphase II Centromeres divide, chromatids move to opposite poles of the cell.
telophase II A nuclear envelope forms around each set of chromosomes.
Created by: mrsnieves
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