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description
Transcript of ________________
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Taking another look at DNA
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DNA… A Quick Review
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What are chromosomes?
Chromosomes are ________________________________.
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Structure of Chromosomes
Sometimes you may see chromosomes in ________. #
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Chromosomes come in ________________________
The other matching half comes from the ____________.
Half the chromosomes come from the ____________. #
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What are genes?
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Gene for eye color proteins
Gene for hair color proteins
Genes are _______________________________________________________________________________________
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Different organisms have different ___________________.
Fruit fly DNA
Human DNA
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8 chromosomes (__________)46 chromosomes (__________)
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All organisms have a certain number of chromosomes in their _____________ cells called the diploid number.
__________ (2n)= _____ set of chromosomes (DNA)
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Organism Diploid Number
Human 46 (23 pairs)
Corn 20 (10 pairs)
Dog 78 (39 pairs)
Chicken 78 (39 pairs)
Crayfish 200 (100 pairs)
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All organisms only have half the number of chromosomes in their _________________ called the haploid chromosome number.
__________ (1n)= _____ set of chromosomes (DNA)
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Organism Diploid Number Haploid Number
Human 46 23
Corn 20 10
Dog 78 39
Chicken 78 39
Crayfish 200 200
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Imagine a diploid human sperm and egg cell coming together…
46 Sperm (male sex cell) from Dad
Baby’s Body Cell
46Egg (female sex cell) from Mom
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Now, imagine a haploid sperm and egg cell coming together…
23 Sperm (male gamete) from Dad
Baby’s Body Cell
23Egg (female gamete) from Mom
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Keep these numbers in mind:
Humans have ___ chromosomes, AKA ___ ___________________________.
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