Lecture2_10_stripped-2

Lecture2_10_stripped-2 - But how are the chromosomes...

Info iconThis preview shows pages 1–14. Sign up to view the full content.

View Full Document Right Arrow Icon
But how are the chromosomes actually separated into the daughter cells? The Miracle of Mitosis
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 4
Ingredients for making a metaphase mitotic spindle: Keep the chromatids paired until it is time to segregate. Have unstable kinetochore microtubules that can probe the cytoplasm and only become stable upon being captured by a kinetochore. Give each chromatid a kinetochore with a geometry such that two kinetochore microtubules from the same spindle can’t capture both chromatids of a chromosome. Have a checkpoint that senses when all the chromatids have been captured and only then allow the chromatids to separate.
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 6
Cytokinesis In animals - actin and myosin form a “purse string” that constricts and divides the cell.
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Cytokinesis In plants - vesicles fuse to make cell membrane and cell plate, which becomes a new cell wall dividing the mother cell.
Background image of page 8
Cytokinesis
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Cytokinesis (or lack thereof) Some cells don’t bother to divide their cytoplasm. Example: muscle cells have many nuclei (they are syncytial ) because the go through mitosis without cytokinesis.
Background image of page 10
Sex : mixing the genetic material of two organisms.
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 12
Before sexual reproduction, you must reduce the number of homologs by half.
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 14
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 32

Lecture2_10_stripped-2 - But how are the chromosomes...

This preview shows document pages 1 - 14. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online