Amanpreet Sandhu
AC1601688
SC160.3.1 Basic Biology
Assignment 08
December 21, 2017
DNA is labeled as the genetic blueprint of life, simply because it contains the instructions
that govern the development of an organism. DNA is made up of something called repetitive
DNA, which is of particular use in forensic DNA analysis. Inside this region of DNA are unique
repeating patterns that can be used to differentiate one person from another. These patterns are
known as short-tandem repeats (STRs), they can be measured to define the DNA profile of an
individual. One example of how DNA is used within forensic science is if a person touched an
object or weapon, skin cells may have been left behind. This low-level DNA is sometimes
referred to as “touch DNA”, low-level DNA samples are helpful when examining an object
where retrieving a fingerprint would be difficult. Another example is liquid blood or blood stains
that can be collected from a crime scene; forensic scientist can used the DNA from the blood
samples to determine who blood is it to help solve a case. Forensic scientist can also collect and
analyze DNA from hair samples that could be left behind or near a crime scene. These small
DNA samples are very helpful to forensic scientist in connecting missing pieces.
Population evolution is defined by the changes a population experience over time. These
changes can affect all organisms within a population whether they are single microorganisms or
multicellular organism. Over time, species that are more habitable for a specific environment
survive while the weaker ones will die. This process of evolution creates species that will
produce off springs that will be adapted to their environment; this growth is caused from natural
selection. Charles Darwin was the first to explain natural selection. Microbial life first started
billions of years ago, first with the prokaryotes and later on the eukaryotes. Microorganisms are
microscopic organism that cannot be seen with the naked eye but these organisms makes up life
on earth as we know it today, all living things on earth is made up from microorganisms. One
example of microevolution is colonial forms, this process allow unicellular protists to stick
together as loose federations of independent cells. This transition creates true multicellular
organism. Another example is the Flinch bird found on the Galapagos Island, these birds are
found elsewhere throughout the world but the ones on the island had larger beaks because of the
