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Name: __________________________ Notes – Chromosome Counting Date: __________/Page#: ____ Mr. Jensen/Period: ____ Chromosome Counting! What are chromosomes? Double rods of condensed ________________________ _____________________ is the material in cells that contains DNA and carries genetic information (the blueprint of the organism) chromosome chromatin Chromosome numbers All plants and animals have a certain number of chromosomes in their body cells called the _________________ (or 2n) number. Let’s 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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