What is a gene?
A "recipe" for how to make a protein.
A sequence of DNA nucleotides that provide a chemical message for printing a protein.
Denim pants
What is a locus?
A "fixed address" on a chromosome
A cicada
A "street map" for where certain genes are on the chromosomes
What is an allele?
A group of genes that determine a trait
One of different versions of a gene
Variations of a protein recipe
Blood Type A alleles
A101
C3PO
A201
Blood Type B allele
Type B only has one allele
B101
All about that bass
Blood Type O allele
O01
O02
O03
Why are the "O" allele blood-type proteins non-functional?
Because they are the wrong sequence of amino acids.
A nucleoide has been deleted from the 258th position on the gene.
Every amino acid after the deletion is wrong!
Varied alleles lead to....
Varied proteins
The same proteins
Both functional and non-functional proteins
What is a phenotype?
A record player
An inherited physical characteristic
What you look like, based on your genes
One-gene phenotypes are
The physical characteristics resulting from an allele at a single locus
For example, what color socks you buy
For example, blood type
Poly-genic phenotypes are...
Alleles at two or more loci
Produce proteins that interact to produce a physical trait
For example, skin color, hair color, and eye color
We inherit
1 set of chromosomes
2 sets of chromosomes
3 sets of chromosomes
What is a recessive allele?
An allele that is only expressed when there are no dominant alleles around.
An allele that is always expressed
