Genetics

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Genetics
Part
1
You have your genes to thank
– or blame for how you look
• Genes are
your body's
instruction
manual.
• They affect the
way you look,
your health,
and the way
your body
works.
Heredity is the passing on of
characteristics from one generation
to the next.
• It is the reason why
offspring look like
their parents.
• The study of heredity
is called genetics
and scientists that
study heredity are
called geneticists.
Genes and Inheritance
• Your genes are unique –
unless you have an
identical twin.
Genes and Inheritance
• Half of your genes are from your mother
• the other half are from your father,
• who, in turn, received their genes from
their parents,
• and so on, right back to
your earliest ancestors
DOMINANT & RECESSIVE
• Certain genes are
dominant, and you
only need one of the
pair to give you its
trait.
• Dominant genes are
represented as
capital letters and
recessive genes as
lower-case letters.
Some
Human
Traits
Some
Human
Traits
6 Fingers
and
Toes
Are Dominant
Alleles
• Are all the
possible
genes for a
trait
The Gene Locus
• Is the location
of a gene on
the on the
chromosome
Genotype
vs
Phenotype
• Genotype
Is the actual
genes that an • Phenotype
individual has
the physical
for a trait
expression of
the genes
Let’s check your understanding
with……….
A Game of X’s and O’s
1
2
4
7
3
5
8
6
9
Scoreboard
1
2
3
X
4
5
6
O
7
Click Here if
X Wins
Click Here if
O Wins
8
9
1
What structure on chromosomes
carry the instructions for a trait?
1
Home
Genes
2
What is the passing of characteristics
from one generation to the next?
2
Home
Heredity
3
What is the study of heredity?
3
Home
Genetics
4
True or False: You get all of your
genes from your mother.
4
Home
False
5
You must have two of these genes
in order for it to be expressed.
5
Home
Recessive
6
All the possible genes for a trait
6
Home
Allele
7
The location of a gene on a
chromosome
7
Home
Locus
8
True or False: The color purple is an
example of genotype
8
Home
False
9
True or False: Dominant genes are
represented by capital letters
9
Home
True
Adapted From
Presentation
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