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BIO > chapter 8 > Flashcards

chapter 8 Flashcards

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Biology 101 flashcards
1
Q

reproduction

A

organisms have a drive to preoduce (pass on their genes to the next generation

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2
Q

two ways of reproduction

A
  1. sexual reproduction

2. asexual reproduction

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3
Q

sexual reproductino

A

fertilization of an egg by a sperm (multicellular organisms)
many eukaryotic cells reproduce sexually
by fertilization of an egg by a sperm, 1. organisms produce replicates with a wide range of variation and 2. variation helps the species survive through all kinds of environmental changes

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4
Q

asexual reproduction

A

organismas divide in half making two exacct duplicates (single celled organisms)

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5
Q

binary fission

A

dividing in half; done in asexual reproduction

  1. chromosomes (DNA) are duplicated and migrate to oppostie sides of the cell
  2. cell divides in two (each cell is an exact duplicate of each other)
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6
Q

reasons cells reproduce themselves

A
  1. enable a multicellular organism to grow to adult size
  2. replace worn out or damaged cells
  3. add new cells (ex: more muscle as a result of exercise)
  4. reproduction of the species (meiosis)
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7
Q

chromosomes

A

gene-carrying structure found in the nucleus (gene)
before cells replicate that duplicate their dna
when chromosomes duplicate, the two exact duplicates are attache at the centromere forming sister chromatids

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8
Q

gene

A

a discreet unit of heredity

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9
Q

chromatin

A

what chromosomes are called in uncondensed form (most of the time)

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10
Q

human cells carry around ___ genes on ___ chromosomes

A

25,000, 46

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11
Q

karyotype

A

a set of chromosomes for an individual in pairs

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12
Q

cell cycle

A

the time between cell division

1. interphase

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13
Q

interphase

A 
most of the time; variable length of time, cell is doing its "job"; s-phase (synthesis phase when dna is synthexized which means it is duplicated or replicated); g phasees (gaps); m-phase (mitosis when the cell is dividing)
cell is active, doings its job
chromosomes in chromatin form
preparation for cell division
see slides
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14
Q

prophase

A
  1. chromatin fibers coil up and chromosomes are visible (sister chromatids joined at centromere
    2 nuclear envelope begins to break up
  2. mitotic spindle begins to appear
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15
Q

metaphase

A
  1. mitotic spindle is fully formed
    • sister chromatids brought to the center of the cell, along an imaginary equator (microtubules are pulling from each side, bringing chromosomes to the middle)
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16
Q

mitotic spindle

A

“spoke-like” microtubules that attach to chromosomes at centromere

17
Q

anaphase

A
  1. some microtubules shorten, pullin sister chromatids apart (moving them toward opposite poles)
  2. other microtubules lengthen ushing cell poles apart (elongating the cell)
18
Q

telophase

A

begins when the two sets of chromosomes reach opposite cell poles (two sets of nuclei)

  1. spindle disappears
  2. nuclear envelopes begins to reform
  3. chromosomes begin to uncoil going back into chromatin form
19
Q

cytokinesis (in animal cells)

A

cell divides in two

  1. cleavage furrow forms
  2. microfilaments contract (like pulling drawstrings ; two daughter cells with the exact duplicate dna)
20
Q

cancer

A

a disease where cells within the organism are dividng out of control (over 200 types exist); the cancer cells keep dividing because they ignore the signals that usually tell them to stop dividing
tumors/cancer grow from a single cell

21
Q

tumor

A

an abnormal mass of cells; starts from a single cell

22
Q

contact inhibition

A

a control mechanism where normal animal cells stop dividing when they come in contract with other cells; signal are released “telling” the cells to stop dividing

23
Q

benign tumors

A

abnormal mass of essentially normal cells; not as dangerous, generally speaking

  • do not invade other tissue
  • stay in their original place
  • can often be completely removed by surgery (unless they are growing in certain organs such as the brain or pancreas)
24
Q

malignant tumors

A

cancerous tumors; cells have changed to become more dangerous

  • can invade neighboring tissue
  • can spread to other parts of the body (metastasis)
  • can be very hard to remove by surgery since they often have spread into neighboring tissue
25
Q

metastasis

A

spread of cancer beyond its original site

26
Q

cancer treatments

A

attempt to halt the spread of cancer cells by disrupting cell division thus stopping them from dividing

  • radiation treatment
  • chemotherapu
27
Q

radiation treatment

A

high energy radiation is used to disrupt cell division often by messing up the DNA (negative side effects: normal cells are also damaged)

28
Q

chemotherapy

A

uses drugs to disrupt cell divison

  • different drugs effect different stages of mitosis
  • negative side effects (some normal cells take up the drugs also and are killed)
29
Q

male

A

xy

30
Q

female

A

xx

31
Q

homologous chromosomes

A

23 pairs; means the same or similar
chromosomes that carry the information for same inherited characteristics; there may be differences in variations of the trait *eye color, hieght etc)

32
Q

passing on genes to the next generation

A

each parent gives us half of our dna - 23 chromosomes
in passing on genes to the next generation, the number of chromosomes has to be divided in half or the number would keep doubling

33
Q

meiosis

A

in the egg and sperm the number of chromosomes is half the number found in other cells (haploid)
Meosis is the process that produces haploid egg and sperm (chromosomes are duplicaed then go through two consecutive cell divisions

34
Q

haploid

A

a single set of chromosomes

35
Q

gonads

A

the ovaries and testes; place where meiosis takes place

BIO (18 decks)

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