Biology- DNA and cell division 0.0 / 5 ? BiologyDNA and inheritanceGCSEAQA Created by: Lucy DearmanCreated on: 23-02-14 16:12 How many chromosomes are there in a human cell? 23 pairs, 46 in total 1 of 13 Where do chromosomes come from? In the nucleus 2 of 13 What are chromosomes made up of? They are made up of long DNA molecules 3 of 13 What is fertalisation? When a male gamete fuses with a females gamete to produce a new cell 4 of 13 What is mitosis? When body cells are divided 5 of 13 What is meiosis? When gametes are produced 6 of 13 What is DNA? Carries a genetc code that determinds the characteristics of a living thing 7 of 13 What is a gene? A short secetion of DNA. It specifies the order in which the amino acids join together 8 of 13 What are the stages of mitosis? 1) the genetic material is copied 2) The cell divides once to form two gentically identical body cells 9 of 13 When does mitosis occur? During growth or to produce replacement cells 10 of 13 What are gametes? Sex cells, they contain one set of gentetic information 11 of 13 What happens when fertalisation occurs? A single body cell with new pairs of chromosomes are formed. This cell is then divided again by mitosis which creates many cells 12 of 13 What are the stages of meiosis? 1) Copies of the genetic information are made 2) The cell divids twice to form four gametes 13 of 13
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