somatic or body cells ... germ cells in the testes or ovaries
Looking through a light microscope at a cell undergoing division, you see that the condensed chromosomes have lined up along the midline of the cell. The homologous pairs are NOT joined in tetrads. Each chromosome takes its own place in line, independentof its homolog. You are witnessing
metaphase of mitosis
Fertilization joins _____ to produce a _____.
haploid gametes ... diploid zygote
Duplication of the chromosomes to produce sister chromatids _____.
occurs in both mitosis and meiosis
If it weren't for _____, chromosome number would double with every generation of sexual reproduction.
Accidents can occur in meiosis wherein members of a chromosome pair fail to separate at anaphase. This is called _____.
When chromosomes don't separate, it is called nondisjunction. The resulting gametes can have either too many or too few chromosomes
Anaphase II is essentially the same as mitotic anaphase except that in anaphase II ______ and in mitotic anaphase ______
the cells are haploid and sister chromatids separate... the cells are diploid and sister chromatids separate
Meiosis I produces _____ cells, each of which is _____.
two ... haploid. At the end of meiosis I there are two haploid cells.
Meiosis II typically produces _____ cells, each of which is _____.
four ... haploid. At the end of meiosis II there are typically 4 haploid cells.
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