Meiosis

Life Science - Middle School

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Meiosis I Meiosis II Meiosis During meiosis, a parent cell divides into four sex cells each with half the number of chromosomes as the parent cells. Sex cells of males are called sperm cells and sex cells of females are called egg cells. Anaphase I The chromosome pairs split and pull apart to opposite ends of the cell. Anaphase II The centromeres split and the single chromosomes move apart to opposite ends of the cell. Metaphase II Chromosome pairs line up in the middle of the cell. Prophase II Double-stranded chromosomes and spindle fibers reappear in each new cell. Telophase II & Cytokinesis Four sex cells are produced, each with only one chromosome from each original pair. Punnett Square female parent male parent A Punnett Square shows all the possible allele (gene) combinations in the offspring of two organisms. RR Rr Rr rr Rr Rr R r R r Prophase I Before meiosis begins, chromosomes in the parent cell are copied. The nuclear membrane breaks apart and spindle fibers begin to form. Telophase I & Cytokinesis The cells split and each of the two new cells formed has half the number of chromosomes. Metaphase I The chromosome pairs line up in the middle of the cell and the spindle fibers attach to each chromosome at the centromere. www.newpathlearning.com © Copyright NewPath Learning. All Rights Reserved. 94-4632 Meiosis
Key Vocabulary Terms allele Interphase Anaphase Metaphase centromere Prophase chromatin Punnett square chromosome sex cells Cytokinesis sperm cells egg cells spindle fibers gene Telophase Meiosis I Meiosis II Meiosis During _________________ , a parent cell divides into ____________ sex cells each with ____________ the number of chromosomes as the parent cell. Sex cells of males are called ________________ ____________ and sex cells of females are called ____________ ____________ . __________________ The _______________ _______________ split and pull apart to opposite ends of the cell. Anaphase II The _______________ split and the single _______________ move apart to _________________ _________________ of the cell. Metaphase II _________________ pairs line up in the _________________ of the cell. Telophase II & Cyto kinesis Four ___________ ___________ are produced, each with only _____________ chromosome from each original pair. __________________ Before _________________ begins, ___________________ in the parent cell are copied. The nuclear membrane breaks apart and _________________ _________________ begin to form. __________________ & __________________ The cells _____________ and each of the two new cells formed has _____________ the number of ____________________ . __________________ Double-stranded ____________________ and __________________ ________________ reappear in each new cell. __________________ The ___________________ ________________ line up along the ________________ of the cell and the ________________ ________________ attach to each chromosome at the ___________________ . Punnett Square female parent male parent A Punnett Square shows ________________________________ ____________________ _________________. Rr Rr R r R r www.newpathlearning.com © Copyright NewPath Learning. All Rights Reserved. 94-4632 Meiosis \|xiBAHBDy01756rzu