Unit two: Genes and Heredity Flashcards
The mitotic stage(S) when chromatin condenses
prophase
The mitotic stage (S) when spindle fibers are present
prophase, prometaphase, metaphase, anaphase and telophase (all of Mitosis)
The mitotic stage(s) when the nucleus may be visible.
prophase and telophase
The mitotic stage(s) when a nuclear membrane may be visible
prophase, prometaphase, telophase
The mitotic stage(s) when kinetochores are linked with spindle fibers
prometaphase, metaphase, anaphase and telophase
The mitotic stage(s) when centrosomes are at opposite sides of the cell
prometaphase, metaphase, anaphase and telophase
The mitotic stage(s) when ds chr are present in the cell
prophase, prometaphase, metaphase
The mitotic stage(s) when the ploidy level is 2n
prophase, prometaphase, metaphase and telophase
Mosquitoes have a haploid number of 3, how many molecules of DNA will be present during metaphase.
metaphase is 2n so 3x2= 6 chr, two molecules of DNA per chr so 12 molecules of DNA
Homologous pairs definition:
Two chromosomes with same size, same type, same shape, same place of centromere and same genes
Definition of kinetochores
Special structures positionned on opposite sides of the centromere. Serves as attachment points between spindle fibers and chr. They can synthesize spindle fibers
Animals cell divide by forming …
a cleavage furrow which pinches the cell closed
Plant cells divide by forming…
a cell plate: a fusion of vesicles inside the cell at the division boundary
Name six events that are require for the chr to divide in mitosis
- Chromatin condenses into chromosomes
- Spindle fibers microtubules are present and functional
- Kinetochores are present and functional
- Nuclear membrane breaks down
- Centrosomes are present and functional
- Chromosomes must be ds
Match the phrase to the phase of Mitosis:
Centromeres divide, sister chromatids separate
anaphase
