Question

1. Explain the differences between an intron and an exon? (4pts) 2. Why do you see different size bands in Homozygous recessive, Homozygous dominant and Heterozygous student sample in PTC experiment? (4pts) 3. In the PTC lab, we determined the frequency of two alleles, the "+allele" and the "- allele" in a sample population (our class). What was the difference between these two alleles? (4pts) 4. Define evolution be sure to include in your definition what actually evolves. (Spts) 5. Describe the principles of natural selection. (5pts)

Answer 1

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1. Difference between intron and exon

I will set up the differences in a tabular form for better understanding

Exon	Intron
By definition,an exon is a nucleic acid sequence that is represented in the RNA molecule.	By definition, an intron is a nucleic acid which are seen within genes that are removed via RNA splicing
These are coding areas in a gene	These are non coding areas in a gene
Exons are very much conserved due to changes in sequence over time and species not being frequent	Introns are less conserved due to their frequent change in sequence over time
These are translated into mRNA	These arent translated into mRNA but are found between exons