Unit 8, Quiz 2 - DNA and Genes
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Science
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6th - 8th Grade
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Medium
Standards-aligned
Dayan Martinez
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7 Slides • 6 Questions
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Unit 8, Quiz 2
DNA and Genes
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Multiple Choice
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Multiple Choice
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So, what do you know about the structure of DNA?
+ Double helix
+ Has 4 nucleotides
+ They make 2 base pairs
+ It's a code!
+ Base pairs are A+T and G+C
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Multiple Choice
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Multiple Choice
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So, about genes...
+ Humans have about 25,000 genes
+ They're written like sentences:
--- Each base pair is a letter
--- Three letters make a codon
--- Codons are like words
--- Many codons make a gene
But wait, there's more!
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More about genes...
+ One copy from each parent
+ Each copy is called an allele
+ Only one copy is read at a time
--- This is the "dominant" copy
--- The other one is "recessive"
--- Unless there's TWO recessives
+ Dominant alleles always show
--- Examples: dark hair/eyes
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Multiple Choice
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Unit 8, Quiz 2
DNA and Genes
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