Untitled Flashcards Set

Driving Question

How are traits determined and how do they pass from parent to offspring.

Idea 1

Sexually reproducing organisms have two factors that determine each trait(Inherited characteristics) one from each parent. 

Idea 2

Genes from a trait can occur in different versions called alleles. 

If there are two variations of a trait in a population and there are two alleles (1 and 2) then there can be three combinations of alleles (1,1) (1,2) and (2,2).

Idea 3

Idea 4

Traits are USUALLY inherited independently from one another.

When there are three variations of a trait and two alleles, each genotype 11 12 22

Vocab- trait

Physical characteristic of an organism, ex hair/ eye color. 

Gene 

Portion of DNA that determines a trait, ex gene for hair/ eye color.

Alleles

Different versions of genes for the same trait. Ex for the gene for eye color their are blue and brown eyes.

Phenotype(Physical) 

The variation of a trait that SHOWS in an individual. Ex blue eyes

Genotype(Genetic)

The combination of alleles that an individual has . ex (1,1) (1,2) (2,2).

Dominant

The allele that will always show when present, ex purple flower. 

Recessive 

The allele that will only show if no dominant allele is present, ex white flower, white mouse.

Homozygous

A genotype in which the two alleles are the same. 

Heterozygous

A genotype in which the two alleles are different. Ex (1,2)