Transcript Human Genetics WF, ML , SFdf

By Will Fyfe, Max Leal and Sasha Fenimore
HUMAN GENETICS
WHAT IS A GENE?

A gene is a portion of DNA that makes up our
bodies instruction manual. Genes decide what
we look like, talk like, and other personal traits.
WHERE DO THEY COME FROM?

Genes come from our parents, each person
receives some genes from their mom and some
from their dad. So in a sense each person is
just their parents combined into one person.
DNA AND GENES
One strand of DNA contains many genes.
 DNA is found in our blood, as blood runs
throughout our whole body and can be seen as
an easy way to distribute DNA
 If you pulled the DNA from a single human cell,
the strand would be more than one meter long!

WHAT ARE TRAITS?
Traits are specific charateristics given to the
offspring.
 There are two kinds of traits, dominant and
recessive.
 Traits show explain why some people have
brown hair while some people have blonde hair

DOMINANT TRAITS
A Dominant Trait is to be considered dominant
because it dominates of “masks” the factor
(specific characteristic)
 The dominant trait is represented ad a capital
letter on a Punnett Square

RECESSIVE TRAITS
Recessive traits do not dominate the factor,
they control it thus making it look different from
the rest.
 Some traits appear in an organisms gene code
but still don’t show through it’s apperance. This
is due to a mutation, the sex of the organism or
many other reasones.
 This is called a hidden ressecive.

WHAT IS A PUNNETT SQUARE
A Punnett spuare is a chart that shows the
traits of the parents of an organism, wether
they be dominant of recessive, and give the
probability of that organisms gene code for that
factor.
 It will show if it will be dominat, recessive, if it
has a hidden recessive, mixed hybrid or all of
the above.

PUNNETT SQUARE
CHROMOSOMES
DNA packed into a single cell is called a
chromosome
 Chromosomes are what your parents pass on
to your DNA system.
 Each person has 46 chromosomes, 23 from
each parent. This is why relatives have similar
physical features. (Hair, Eyes, etc)

PROTEINS
Each person has 100,000 cells in their body,
each has their own job in the body
 Proteins are the machines that make every
thing work
 Every cell contains thousands of proteins that
all contribute to the working of the cell

FIN!!!!!!!!!!

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