OCR A Level Biology:复习笔记2.6.9 Stem Cells
Features of Stem Cells A stem cell is a cell that can divide (by mitosis) an unlimited number of times Each new cell (produced when a stem cell divides) has the potential to remain a stem cell or t...
OCR A Level Biology:复习笔记2.6.8 The Organisation of Cells
The Organisation of Cells As seen on the last page, in complex multicellular organisms eukaryotic cells become specialised for specific functions. For example: Epithelial cells in the small intesti...
OCR A Level Biology:复习笔记2.6.7 Specialised Cells
Specialised Cells In complex multicellular organisms, eukaryotic cells become specialised for specific functions These specialised eukaryotic cells have specific adaptations to help them carry out ...
OCR A Level Biology:复习笔记2.6.6 The Significance of Meiosis
Significance of Meiosis Having genetically different offspring can be advantageous for natural selection Meiosis has several mechanisms that increase the genetic diversity of gametes produced Both ...
OCR A Level Biology:复习笔记2.6.5 The Stages of Meiosis
Stages of Meiosis Meiosis is a form of nuclear division that results in the production of haploid cells from diploid cells It produces gametes in plants and animals that are used in sexual reproduc...
OCR A Level Biology:复习笔记2.6.4 The Significance of Mitosis
Significance of Mitosis Mitosis is the process of nuclear division by which two genetically identical daughter nuclei are produced that are also genetically identical to the parent nucleus The proc...
OCR A Level Biology:复习笔记2.6.3 Identifying Mitosis in Plant Cells
Identifying Mitosis in Plant Cells Growth in plants occurs in specific regions called meristems The root tip meristem can be used to study mitosis The root tip meristem can be found just behind the...
OCR A Level Biology:复习笔记2.6.2 The Stages of Mitosis
Stages of Mitosis Mitosis is the process of nuclear division by which two genetically identical daughter nuclei are produced that are also genetically identical to the parent cell nucleus (they hav...
OCR A Level Biology:复习笔记2.6.1 The Cell Cycle
The Cell Cycle Mitosis is part of a precisely controlled process known as the cell cycle The cell cycle is the regulated sequence of events that occurs between one cell division and the next The ce...
