Class Copy

DNA Determines the Smew Key

Source: http://www.biologycorner.com (snorks). Heavily modified by B.Rick

In this simulation, you will examine the DNA sequence of a fictitious organism - the Smews. Smews were discovered on the planet Mergellus in a distant solar system. Smews only have one chromosome with nine genes on it. Your job is to analyze the genes of its DNA and determine what traits the organism has and then sketch the organism (You can be creative here).

For simplicity, the gene sequences are much smaller than gene sequences found in living organisms. Each gene has two versions that result in a different trait being expressed in the Smews.


Genes Amino Acid Sequence Description
Gene 1 - body covering val - ser - leu hairless
val - ser - lys hairy
Gene 2 - body style tyr - pro - glu plump
val - pro - thr skinny
Gene 3 - legs leu - leu - leu 3 legged
leu - leu - ser 2 legged
Gene 4 - head shape asp - val - val round head
val - asp - asp square head
Gene 5 - tails his - iso - thr tail
his - his - thr no tail
Gene 6 - body pigment ser - pro - val blue pigment (hair/skin)
val - phe - tyr red pigment (hair/skin)
Gene 7 - eyes asp - iso - leu small slanted eyes
asp - iso - pro large round eyes
Gene 8 - mouth val - asp - asp circular mouth
asp - asp - asp rectangular mouth
Gene 9 - ears phe - ser - gly pointed standing-up ears
phe - phe - gly rounded floppy ears

DNA samples were taken from volunteer Smewss. Your job is to analyze a DNA sample and determine the phenotype (how the organism looks) based on the sequence. For simplicity the start codon (AUG) and the stop codon are not in the DNA sequence. The genes are in order from gene 1 to gene 9. There are three codons per gene.

 
Name:

Smews DNA Sample 1


DNA CAA AGC GAC ATA GGC GTT GAC GAC GAC CTG CAA CAA GTA TAG TGC
mRNA GUU UCG CUG UAU CCG CAA CUG CUG CUG GCA GUU GUU CAU AUC ACG
Amino Acid val ser leu tyr pro glu leu leu leu ala val val his iso thr

DNA AGC GGC CAA CTG TAG GAC CAA CTG CTG AAA AGC CCT
mRNA UCG CCG GUU GAC AUC CUG GUU GAC GAC UUU UCG GGA
Amino Acid ser pro val asp iso leu leu asp asp phe ser gly

Phenotype

Genes Description
Gene 1 - body covering hairless
Gene 2 - body style plump
Gene 3 - legs 3 legs
Gene 4 - head shape round
Gene 5 - tails tail
Gene 6 - body pigment blue
Gene 7 - eyes small slanted
Gene 8 - mouth circular
Gene 9 - ears rounded floppy ears

Drawing

 
Name:

Smews DNA Sample 2


DNA CAA AGC TTT CAA GGC TGC GAC GAC AGC CAA CTG CTG GTA GTA TGC
mRNA
Amino Acid

DNA CAA AAA ATA CTG TAG GGC CTG CTG CTG AAA AAA CCT
mRNA
Amino Acid

Phenotype

Genes Description
Gene 1 - body covering  
Gene 2 - body style  
Gene 3 - legs  
Gene 4 - head shape  
Gene 5 - tails  
Gene 6 - body pigment  
Gene 7 - eyes  
Gene 8 - mouth  
Gene 9 - ears  

Drawing

 
Name:

Smews DNA Sample 3

DNA CAA AGC TTT CAA GGC TGC GAC GAC GAC CAA CTG CTG GTA TAG TGC
mRNA
Amino Acid

DNA CAA AAA ATA CTG TAG GAC CTG CTG CTG AAA AGC CCT
mRNA
Amino Acid

Phenotype

Genes Description
Gene 1 - body covering  
Gene 2 - body style  
Gene 3 - legs  
Gene 4 - head shape  
Gene 5 - tails  
Gene 6 - body pigment  
Gene 7 - eyes  
Gene 8 - mouth  
Gene 9 - ears  

Drawing

 
Name:

Smews DNA Sample 4

DNA CAA AGC TTT ATA GGC GTT GAC GAC AGC CTG CAA CAA GTA GTA TGC
mRNA
Amino Acid

DNA AGC GGC CAA CTG TAG GGC CAA CTG CTG AAA AAA CCT
mRNA
Amino Acid

Phenotype

Genes Description
Gene 1 - body covering  
Gene 2 - body style  
Gene 3 - legs  
Gene 4 - head shape  
Gene 5 - tails  
Gene 6 - body pigment  
Gene 7 - eyes  
Gene 8 - mouth  
Gene 9 - ears  

Drawing