In this article we will discuss about the genotype and phenotype variations of corolla in plants. East in 1910, 1916 performed experiments on flower length in Nicotiana longiflora. He took two homozygous, pure breeding lines differing in flower length, one having 41 cm the other 93 cm for average length of corolla. The minor variations in flower length within a [...]
In this article we will discuss about the pre-mendelian era birth of mendelism. Pre-Mendelian Era: Man’s curiosity to know about transmission of hereditary characters is as old as humanity itself. From the earliest times it had been noticed that the offspring may resemble their parents, grandparents, or other relations. Around 300 BC the great Aristotle had observed that peculiarities of [...]
The following points highlight the six main types of genes. The types are: 1. Complementary Genes 2. Duplicate Genes 3. Polymeric Genes 4. Modifying Genes 5. Lethal Genes 6. Moveable Genes. Type # 1. Complementary Genes: Bateson and Punnett crossed two different white flowered varieties of sweet pea and obtained an F1 progeny of red flowered plants. On self-pollination the [...]