Bio 141 Notes (3/20/14) Flashcards Preview

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Flashcards in Bio 141 Notes (3/20/14) Deck (18):
1

Cells must _____ their DNA before they can divide

double

2

Sister Chromatids are

identical

3

Homologus

same length, same centromere position, same genes in the same order

4

Mitosis

Several defined phases
divide coped DNA between 2 daughter nuclei
cytokinesis
happens in SOMATIC cells

5

Cytokinesis

one CELL into two

6

Somatic

body cells
(non sex cells)

7

Mitosis vs Meiosis

Mitosis - somatic cells, exact copies
Meiosis - sex cells, 2n-> n

8

Interphase

span of time when the cells are not actively dividing
chromosomes are loosely arranged
eukaryotic

9

Prophase

Chromosomes coil (become recognizable)
X shape (2 exact copies, joined together at centromere)
nuclear envelope dissolves

10

Metaphase

chromosomes line up along median plane/equator
microtubles pull centromeres towards poles

11

Anaphase

sister chromatids separate and begin moving toward opposite poles

12

Telophase

Chomosomes reach poles at each end of cell
relax into loose strands again
nuclear membrane reforms

13

Cytokinesis

mitosis dividing 1 nucleus into 2
cytokinesis dividing 1 cell into 2

14

Mitosis happens at area of …

Growth

15

Number of nuclear division

Mitosis - one
Meiosis - two

16

Number of cell dividions

Mitosis - one
Meiosis - two

17

End number of cells

Mitosis - two
Meiosis - Four

18

End DNA relative to starting cell

Mitosis - same
Meiosis - half