3: Investigating mitosis in root tips Flashcards

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1
Q

The actively dividing cells in the tip of the root is called a ______

A

Meristem

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2
Q

In order to see chromosomes in cells, cells must be s______

A

separated

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3
Q

You can separate cells by breaking down the m______ l______ of pectin

A

middle lamellae

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4
Q

Name the chemical solution that will breakdown pectin

A

Hydrochloric acid (HCl)

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5
Q

Name the stain used to see the chromosomes.

A

Aceteic orcein

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6
Q

What concentration of HCl will be needed and at what temperature?

A

1 mol dm-3

60 dC

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7
Q

Once the roots are submerged, leave them in for ____ minutes

A

5 minutes

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8
Q

Take out roots and rinse with water.

What length should roots be cut to?

A

5 - 10 mm

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9
Q

Place the root tips in ______ ________ for ___ minutes at ___ dC.

A

Aceteic orcein

5 minutes

60 dC

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10
Q

Take roots out and with a drop of water tease root tip apart. This process is called ________

A

Maceration

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11
Q

Place cover slip and gently squish tissue in order to put under the __________

A

microscope

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12
Q

Mitotic index =

A

total no of cells in scope

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13
Q

How could you estimate the time cells spend in each stage of mitosis?

A
               total no of mitotic cells
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14
Q

Why is it difficult to identify stages in mitosis under a microscope?

A

Mitosis is a dynamic process,

many cells would be fixed during transition from one stage to another

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