Bio I Midterm II

Home > Preview

The flashcards below were created by user dorsalthorns on FreezingBlue Flashcards.

Monohybrid Cross
- Breeding (i.e. cross-pollination) two varietes that differ for one trait
- i.e. colour of flower: purple P and white p
Alleles

Alternative form of a gene
First fillial

First generation (after paretnal generation)
Homozygus Dominant

Same alleles, i.e. PP
Homozygous Recessive

Same alleles; i.e. pp
Heterozygous
- Two different alleles
- i.e. Pp, pP
Incomplete dominance (co-dominance)
- Both alleles are expressed
- i.e. Red flower cross-pollinated with white flower becomes pink flower
Dihybrid cross
- Breeding two varieties that differ for two traits
- i.e. Colour and shape
Multiple alleles
- More than two alleles
- i.e. blood types: I^A, I^B, i Rh factor R, r
Polygenic inheritance
- Many genes code for one phenotype
- Gradietnt of phenotypes
- i.e. skin colour, hair colour, eye colour, intelligence, height
Epistasis

When one gene interferes with the expression of another
Pleiotropy
- One gene that effects the expression of many different phenotypes
- i.e. one gene that affects both pigmentation and cross-eyedness
Test cross

Helps differentiate between homozygous dominant and heterozygous genotypes.

Cross unown genotype with a known homozygous recessive genotype