When Does Life Begin?

tanktherapistBiotechnology

Oct 23, 2013 (3 years and 11 months ago)

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When
Does Life
Begin?

It’s a controversial topic, and different people
have deeply
-
held beliefs. The ancient Greeks,
for example believed that the “soul” entered a
baby when it first laughed. What do you
think? Write down your response.

One Approach: The Legal Answer


Life begins at birth.


To be a legal person, you need to have been born first.


Exceptions, etc.


Causing the death of a fetus can be a crime / damage


Abortion (Roe v. wade)


"
For the stage prior to approximately the end of the first
trimester, the abortion decision and its effectuation must be
left to the medical judgment of the pregnant woman's
attending physician.
"


The Biological Answer


You became a
distinct genetic individual
at the moment
of
fertilization
. (NOT “conception”


that refers to the
implantation of the zygote / embryo to the uterine
linning
.)


Meiosis
makes
gametes
, one
half of a
potential
diploid
individual.


Note: In
moss, the
plant is
haploid


so
the new
genetic
individual is a
result of
meiosis, not
fertilization

Dominant Haploids

n

n

2n

n

n

n

Fertilization

Creates
a New Unique
Genetic Identity.

Your Biometric Identity

DNA Fingerprinting with Gel
Electrophoresis

Gel Electrophoresis


Gel electrophoresis
separates DNA fragments
based on their size.



By cutting up DNA with enzymes, different
organisms will have different DNA fragments



You, and everyone else, has a nearly unique
DNA fingerprint.

Gel Electrophoresis
in Criminal
Investigations


Collect suspect & crime scene
DNA.


Amplify / copy DNA with PCR
with standard primers


Cut samples with same
restriction enzyme


Separate DNA
fragments by
gel
electrophoresis
.

DNA Paternity
Testing


Each fragment seen in
child sample must
come from mother or
father.



Which gel has the
right father?



Old HSA
Question


Which of the
species shown is
most closely
related to species
1? Why?

Biotechnology Vocabulary


Recombinant DNA
is DNA that contains
sequences from more than one species.



Gene splicing
is the process of inserting a
gene into another organism’s DNA. (8:30
pt

1)



Cloning

is the process of making identical
copies of DNA or organisms.

Recap


New individual organisms are identifiable as a
result of fertilization (or meiosis is haploid is
dominant generation)


Gel Electrophoresis is a way to uniquely
identify people, and show relatedness.


3 other important DNA technology terms:


Recombinant DNA


Gene splicing


Cloning

Homework:
On Syllabus


Your test Friday (and the HSA) may include the
information on the previous slide.



DNA technology is covered in more detail in
13.1 and 13.2
in your book. I strongly suggest
you read it, though there will be no graded
assignment.



Friday’s Test = chapters 8, 9, 10, + today.
(Whole 3
rd

quarter so far)