ANT203H5 Lecture Notes - Lecture 4: Zygosity, Pangenesis, Phenotype
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Wrote experiments with plant hybrids in 1865. Mendel occupies, with darwin, a prominent place in the fields of genetics and evolution. My scientific labors have brought me a great deal of satisfaction, and i am convinced that before long the entire world will praise the result of these labors. said mendel soon before he died in 1884. Phenotype observable appearance of a given trait in an organism. The expression of a trait is controlled by discrete units, which occur in pairs. In today"s language, these discrete units are known as alleles. The combination of two alleles for a certain gene is a genotype. A genotype can be homozygote, resulting from the combination of the same allele form, or heterozygote, resulting from the combination of alternative allele forms. A graphical depiction of mendel experiments follows. In the 2nd line, the female will only have yellow alleles (since the female is homozygous for yellow)
