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GeneticsPart
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
Genotypevs
Phenotype• Genotype
Is the actual genes that an individual has for a trait
• Phenotypethe physical expression of the genes
Let’s check your understanding with……….
A Game of X’s and O’s
7 8 9
4 5 6
1 2 3
7 8 9
4 5 6
1 2 3Scoreboard
X
O
Click Here ifX Wins
Click Here ifO Wins
1
What structure on chromosomes carry the instructions for a trait?
1
GenesHome
2
What is the passing of characteristics from one generation to the next?
2
HeredityHome
3
What is the study of heredity?
3
GeneticsHome
4
True or False: You get all of your genes from your mother.
4
FalseHome
5
You must have two of these genes in order for it to be expressed.
5
RecessiveHome
6
All the possible genes for a trait
6
AlleleHome
7
The location of a gene on a chromosome
7
LocusHome
8
True or False: The color purple is an example of genotype
8
FalseHome
9
True or False: Dominant genes are represented by capital letters
9
TrueHome