Dani+and+Trayl

The Fab Tan Two's Punnett Square Project

Definitions:
 * True breeding- A plant is true breeding if it only shows one form of a trait after several generations of self-pollination.
 * Monohybrid Cross- A monohybrid cross is a cross that involves only one trait.
 * Parental Generation- (P1) These are the first two individuals that are crossed in a breeding experiment.
 * First Filial Generation- (F1) These are the offspring of the P1 cross.
 * Second Filial Generation- (F2) These are the offspring of the F1 generation self-pollination.


 * 1) Gregor Mendel- Father of genetics. He did genetic experiments on pea plants.
 * 2) Genetics- The branch of biology that focuses on heredity.
 * 3) Heredity- Passing on of traits from parents to offspring.

Why are peas great for genetic experiments?
 * There are several traits that exist in two different forms with no intermediate.
 * The male and female reproductive parts are enclosed in the flower, making it easy to pollinate.
 * It is small, grows easily and quickly and produces a lot of offsprings.

Monohybrid Cross-

P1 Round x Wrinkled (dominant) (Recessive) Dominant=Capital Letter Lower Case=Recessive F1 All Round (All the other 6 traits are the same)

F2 3:1 Round: Wrinkled

Dominant Traits: Purple flowers, yellow seeds, round pods&seeds, green pods, axial flower position, tall.

Example: P1 Tall x Short (phenotype) TT (true-breeding) tt (genotype)

F1 All Tall tt

F2 3:1-3 tall: 1 short TT, Tt, Tt, Tt

Dihybrid Cross- Is a cross that involves two traits. for example, round and yellow crossed with wrinkled and green.