Biology 1001A Lecture Notes - Lecture 5: Dihybrid Cross, Allele, Gamete
20 Jan 2020
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Characteristics of mendel"s work that set him apart as a genetic researcher: before mendel"s discoveries, scientists believed in the blending theory of inheritance. Components of mendel"s explanatory model: variation in traits is due to different alleles, alleles separate randomly into gametes, organisms inherit 2 alleles for each trait. If 2 different alleles are present, only one of those alleles determines the phenotype and it is the. Dominant allele (appearance of heterozygotes determined which alleles are dominant: dominant allele: the allele that determines the phenotype of a heterozygote. Note: dominant alleles do not directly inhibit recessive alleles, but they do determine the character present in the phenotype of an organism. Distribution of progeny (offspring genotypes), given parental genotypes in monohybrid, dihybrid and sex-linked crosses: Location of various alleles on homologues: alleles on homologues are located at the same locus on a chromosome (e. g. a allele on one homologous chromosome located at same locus of a allele on other homologous chromosome)
