Animals (Monohybrid and Dihybrid) Crossing

A Monohybrid Cross is a cross between  two parents that involves only one trait.
For example lets take a cross between a heterozygous mother and father for the height trait.
 Tall = T short = t

In the end you would use a punnet square, and cross the genotypes.
You would end up with a 25% chance for a genotype offspring of TT, 50% chance for a genotype offspring of Tt, and 25% chance of a genotype offspring of tt.
You would have 75% chance of having a phenotype/appearance of a tall kid, and 25% for a shortie, like me.

DiHybrid Cross is when you cross two parents and you are mixing two traits.
For example you are mixing a mother who is heterozygous round and heterozygous yellow. (RrYy) and a father who is the same.
R=round seed, r=wrinkled seed, Y= yellow, y= green

First you would have to come up with all possible combinations in the genotypes of each parent.
Eg. RrYy, if you chose two letters at random, could be RY, rY, Ry, or ry.
so you match those 4 options with the 4 you get from the father and you end up with a possibility from 16 offspring.
In this case the resulting genotype ist 9/16 RRYY, 3/16 RRyy, 3/16 rrYY, and 1/16 rryy
for genotype its 9 yellow round, 3 green round, 3 wrnikled yellow, and 1 wrinkled green.

Thats Monohybrid and DiHibrid Crossing.