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Download Chromosome Counting!
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Chromosome Counting! What are chromosomes? • Double rods of condensed chromatin • Chromatin is the material in cells that contains DNA and carries genetic information (the blueprint of the organism) Chromosomes Numbers • All plants and animals have a certain number of chromosomes in their body cells called the diploid (or 2n) number. Lets try some examples! Zea mays (corn or maize) has 20 chromosomes • How many chromosomes does the parent cell normally have? • How many chromosomes does the parent cell have right before it divides? • How many chromosomes does each of the daughter cells have after cell division? Mus musculus (house mouse) has 40 chromosomes • How many chromosomes does the parent cell normally have? • How many chromosomes does the parent cell have right before it divides? • How many chromosomes does each of the daughter cells have after cell division? Cambarus clarkii (a crayfish) has 200 chromosomes • How many chromosomes does the parent cell normally have? • How many chromosomes does the parent cell have right before it divides? • How many chromosomes does each of the daughter cells have after cell division? Vampires (like Edward) have 50 chromosomes • How many chromosomes does the parent cell normally have? • How many chromosomes does the parent cell have right before it divides? • How many chromosomes does each of the daughter cells have after cell division?
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