Adaptation and Competition, Survival and Species 0.0 / 5 ? ScienceGenetic variationAdaptionGCSENone Created by: spambeth12Created on: 24-04-15 19:55 Where do you find chromosomes? Inside the nucleus of cells in the body 1 of 10 What are chromosomes made of? Long coiled lengths of DNA 2 of 10 What is a gene? What do genes control? A gene is a short section of chromosomes 3 of 10 How many chromosomes do humans have in each body cell? 23 pairs 4 of 10 How many chromosomes are there in human sperm cells? And egg cells? 23 each 5 of 10 Describe the structure of a DNA molecule: A double helix (two chains wound together) 6 of 10 What does variation mean? The differences between living species 7 of 10 What is a characteristic feature? The differences within species e.g. skin colour, height, flower size 8 of 10 What is continuous variation? A feature that can vary over a range of values e.g. height, weight, skin colour, intelligence, leaf area 9 of 10 What is discontinuous variation? A feature that can only take certain values e.g. blood group, the colour of courgettes 10 of 10
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