736047
Description
Flashcards by Morgan Morgan, updated more than 1 year ago
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Created by Morgan Morgan
over 10 years ago
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| Question | Answer |
| What are the two types of cell division? | Mitosis MEIOSIS |
| Cell division for growth & repair is called? | Mitosis |
| Cell division for reproduction is? | Meiosis |
| Normally the chromosomes in the cell nucleus are not visible but by the end of ..........they appear | PROPHASE |
| Each half of a double stranded chromosome is called a ........ | chromatid |
| Before a cell divides into two new cells it must duplicate its genetic material. This occurs during a phase of the cell cycle called? | interphase |
| The stages involved in mitosis? | PROPHASE METAPHASE ANAPHASE TELOPHASE PMAT |
| INTERPHASE | Preparatory stage Nucleus is present Chromosomes not visible – each one is being copied Organelles are being formed to support two new cells |
| PROPHASE | Spindle fibres start to form The nuclear membrane & nucleolus start to disappear Chromosomes appear threadlike and then condense to form double stranded chromosomes |
| METAPHASE | The chromosomes line up at the equator of the cell The centromeres attach to the spindle |
| ANAPHASE | Centromeres split One half of each double stranded chromosome moves to one end of the cell with the centromeres leading By late anaphase the chromosomes reach the poles of the cell The cytoplasm starts to divide |
| TELOPHASE | Cytoplasm finishes dividing Chromosomes fade from view The nuclear membrane and nucleoli form The spindle disappears A second centriole forms in each cell “opposite to prophase” There are now two cells identical to the parent cell |
| MITOSIS Two cells that are genetically identical to original parent cell Human cells contain ... pairs of chromosomes i.e.... chromosomes (Diploid) | 23 and 46 |
| All the cells are derived from one egg cell fertilised by a sperm therefore egg & sperm cells must have 23 chromosomes (Haploid) They are formed by a process called? | MEIOSIS |
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