The scientific study of heredity
heritable feature; ex. eye color
each variant for a character; ex blue brow hazel
a stretch of DNA that codes for a protein
Alternate forms of a gene/factor
Genetic makeup- genes/alleles
combination of alleles an organism has.
how an organism appears
An allele which is expressed (masks the other)
An allele which s present but remains unexpressed (masked)
Both alles for a trait are the same
the organism's alleles for a trait are different
Principle of Dominance
An organism with at least on dominant allele for a particular form of a trait will exhibit that form of the trait
Law of Segregation
pairs of factors (alleles) segregate or separate during the formation of gametes.
Law of Independent Assortment
Two or more factors (alleles) for different characteristics will separate independently of each other when gametes are formed.
situation where one allele is not completely dominant over another (RR = red, WW = white, RW = pink); blended looking traits
both alleles contribute to the phenotype of an organism (ex. Cattle with roan coats)
more than two alleles for a gene are present in the population (ex. Human blood type has three alleles, and two of them are co-dominant!)
The genes for these traits are on the X chromosome, because boys only receive one X chromosome they are more likely to inherit disorders passed to them from their mother who would be a carrier.
produced by the interaction of several genes