Stupid Subject I HATE THIS

Alleles

Different forms of the same gene

Dominant allele

The allele that expresses the trait whenever it is present

Recessive allele

the allele that expresses the trait only when the dominant allele is not present

Genotype

the genetic composition of the organism

Homozygous

Both alleles for a gene are the same

Heterozygous

One allele is dominant and one allele is recessive

Phenotype

the physical appearances determined by the genes

Law of segregation

during gametogenesis, each gamete receives only one allele for every gene

Monohydrib cross

The results of a male and female mating with regard to a single trait

Dihydrib cross

The results of male and female mating with regard to two traits

Law of Independent Assortment

Each allele for a trait moves into the gametes without influencing the other allele for other traits

Pedigree

the record of ancestors for an individual (or family) showing parent/offspring relationships across generations, also called a family tree

Autosome

A chromosome that does not determine the sex of the individual

Sex chromosomes

Two chromosomes that determine the sex of an individual

Sex-linked disorder

A disorder caused by an allele that is found on a sex chromosome