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.
What is a locus?
A "fixed address" on a chromosome
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
Blood Type B allele
Type B only has one allele
All about that bass
Blood Type O allele
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....
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
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