Monohybrid, dihybrid, homozygous, heterozygous

Genotype: The letters that make up the individual. E.g. TT or Tt Phenotype: The physical characteristics of the particular trait. E.g. Tall or short Dominant trait: Signified by capital letter-E.g. T. If the traits you are using are dominant or recessive, thistrait will “overpower“ the recessive trait and will be expressed. E.g. Tt Recessive trait: Signified by small case letter-e.g. t. An organism with a recessive allele for a particular form of a trait will have that form only when the dominant allele for the trait is not present. Homozygous: Has same letters. E.g. TT or tt (same alleles for trait) Heterozygous: Has different letters. E.g. Tt (different alleles for trait) Purebred trait: Also known as true breeding. Individuals genotype is homozygous and will only make one type of gamete. E.g TT will always produces T, and T. tt will always produce t, and t. Gamete: sex cells. Represented by letter N (meaning they are haploid-contain half the chromosomes P generation: The parental generation (Usually the first one in a genetic cross) F1 generation: The first generation of offspring from P generation (means first filial: Latin for “son“) F2 generation: The second generation of offspring from P generation (means first filial: Latin for “son“) Monohybrid Cross: Also known as a Single-Factor Cross. Only one trait is used in the genetic cross. E.g. T=Tall, t=short. Example: Tt x Tt Dihybrid Cross: Also known as a Two-factor Cross. Two trait are used in the genetic cross. E.g. T=Tall, t=short & B=Black fur, b=white fur. Example TtBb x TTBB Incomplete Dominance: One allele is not completely dominant over the other. There is a blending with the heterozygous offspring. E.g. RR=Red, Rr=Pink, and rr=white Co-dominance: Both alleles contribute to the phenotype. Offspring will have combination of two alleles. E.g. RR=Red hair, Rr=Roan (mix of red and white hairs-almost looks pink), and rr=white Sex-linked trait: Genes located on the sex-chromosomes called sex-linked genes. Usually found on theX chromosome. X-linked alleles are always expressed in males because males have only one X chromosome. Multiple Alleles: There are more than two-choices for the allele. Example is human blood group are three possible alleles for this gene. IA, IB, and i. IA and IB are co-dominant. There are fourpossible phenotypes: A, B, AB, and O. #Zygosity #monohybridCross #GeneticsFieldOfStudy #dihybridCross #PunnetSquare