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biology 4.2 genetics
cell cycle, mitosis, meiosis
Question | Answer |
---|---|
Why do we need new cells? | 1. Replacement of lost or damaged cells 2. New cells gradually move outwards, replacing dead cells 3. Growth increasing in size from baby to adult |
Genetics materials exists as a mass of (Chromatin)? | Very long fibers(DNA and protein molecules) |
As a cell prepares to divide, the chromatin condenses, becoming (chromosomes)? | Visible as compact structures. |
Before cell divisions begins, all the chromosomes in a cell are duplicated forming (sister chromatids)? | Sister chromatids |
They are tightly joined at the (Centromere)? | Centrome |