Punnet SquaresThe Punnett square is a square diagram that is used to predict the genotypes of a particular cross or breeding experiment. It is named after Reginald C. Punnett. The diagram is used by biologists to determine the probability of an offspring having a particular genotype.   monohybrid crossA monohybrid cross is a breeding experiment between P generation (parental generation) organisms that differ in a single given trait. The P generation organisms are homozygous for the given trait.  Dihybrid crossDihybrid cross is a cross between two different lines/genes that differ in two observed traits. According to Mendel's statement, between the alleles of both these loci there is a relationship of completely dominant - recessive traits.   Mendelian GeneticsExamples of Dominant vs Recessive Genes Genetics VocabularyDominant allele: An allele that produces the same phenotype whether its paired allele is identical or different Recessive allele: An allele that produces its characteristic phenotype only when its paired allele is identical Coding DNA: Sequence of a gene's DNA that transcribes into protein structures Phenotype: Physical genetic expression Genotype: Internal genetic expression Allele: Variation of a genetic trait Gamete: a Sex cell Gene expression: Conversion of the information encoded in a gene first into messenger RNA and then to a protein Codominance  x-Linked Trait Calico cats are almost always female because the locus of the gene for the orange/non-orange coloring is on the X chromosome.  ExamplesSickle cell: In sickle cell anemia, blood is also chronically low in oxygen  Albinism  Huntington' Disease  Olympic Medalist Sarah Winckless:  Polydactyly:  Cystic Fibrosis: 
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