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