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OBSERVING MITOSIS Free essay! Download now

Home > A Level > Biology > OBSERVING MITOSIS

OBSERVING MITOSIS

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Downloads to date: N/A | Words: 2601 | Submitted: 05-Apr-2011
Spelling accuracy: 96.5% | Number of pages: 12 | Filetype: Word .doc


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Description

To have better understanding in the process of mitosis in onion root tips and apply analytical technique to estimate the relative length of each stage of mitosis

Preview

Title: OBSERVING MITOSIS

Objectives:
To have better understanding in the process of mitosis in onion root tips.
To prepare own onion root tip specimen so as to visualise all the stages of mitosis.
Apply analytical technique to estimate the relative length of each stage of mitosis.
To develop certain experimental skills, namely safety, use of microscopes, producing valid results and recording results.

Introduction:
The genetic information of plants, animals and other eukaryotic organisms are found in individual DNA molecules, or we call them chromosomes. Each human cell possesses 46 chromosomes, while each cell of an onion possesses 8 chromosomes. All cells must replicate their DNA when dividing. During DNA replication, the two strands of the DNA double helix separate, and for each original strand a new complementary strand is produced, producing two identical DNA molecules. DNA replication yields an identical pair of DNA molecules (called sister chromatids) attached at a region called the centromere. Mitosis is an important element in the growth phase of every living organism after the DNA replication. It occurs at somatic (body) cells where the daughter cells still inherit the same number of chromosomes of the parent cell. Formation of an adult organism from a fertilised egg, regeneration, maintenance or repair of body tissues and asexual reproduction are all achieved through the mitotic cell division. Where ...

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