Write two examples of monohybrid crosses and two examples of dihybrid crosses?

Question

can some one help me

Answer 1

mono hybrid would be just one trait:
BB x bb (B= brown, b=blue eyes)
Dihybrid would be two traits
RRGG x rrgg (R=round, r=wrinkled, G=green, g=yellow)

Answer 2

check this out:
http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/M/Mendel.html

A dihybrid cross is a cross in which two hybrids are mated to test for dominant genes and recessive genes in two separate characteristics, and such a cross has a variety of uses in Mendelian genetics and genetic linkage experiments. The dihybrid genotype is usually created when two different parental individuals that are true breeding (homozygous) for different alleles of two genes are sexually crossed or mated together. Their resulting progeny possesses the "dihybrid" genotype and is heterozygous for alleles of two genes. The dihybrid is also often referred to as the double heterozygote. When two dihybrids with the same genotype are mated together, the mating is referred to as a dihybrid cross.

Alleles in genetic crosses are usually indicated by capital and lower case letters with dominant alleles designated by capitals and recessive alleles designated by lower case letters. Thus, a dihybrid cross is usually shown as following the form Aa Bb X Aa Bb. Here one parent (usually female by convention) precedes the X and another parent (usually male) follows the X.

Meiosis is the cellular process of gamete creation, it is quite literally where sperm and eggs get the unique set of genetic information that will be used in the development and growth of the offspring of the mating. The rules of meiosis as they apply to the dihybrid are codified in Mendel's First Law and Mendel's Second Law also called the Law of Segregation and the Law of Independent Assortment.

For genes on separate chromosomes each allele pair shows independent segregation. If the first filial generation (F1 generation) produces four offspring, the second filial generation, which occurs by crossing the members of the first filial generation, shows a phenotypic (appearance) ratio of 9:3:3:1.

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