fbpx
Home / Plant Breeding (page 4)

Plant Breeding

mitosis and meiosis

mitosis and meiosis

The significance of Mitosis are :- 1. It is an equational division through which identical daughter cells are produced having the same amount and type of genetic constitution as that of the parent cell. 2. It is responsible for growth and development of multi-cellular organisms from a single-celled zygote. 3. …

Read More »

Multiple Factor Hypothesis

Multiple Factor Hypothesis or Quantitative inheritance One of a group of nonallelic genes that according to the multiple-factor hypothesis control various quantitative hereditary characters. The multiple factor hypotheses were originally postulated by Yule in 1906. But experimental evidence for the existence of mul­tiple factors was provided by Nilsson-Ehle in 1908; therefore, they are …

Read More »

Mendelian Genetics

Mendelian Genetics

Extensions of Mendelian Inheritance Alleles’  interaction Pleiotropism Epistasis interaction Linkage and crossing over Alleles’ interaction Incomplete dominance Lethal allele Co dominant allele Multiple allele Penetrance and expressivity Epistastic interaction Complementary gene (9:7) Duplicate gene (15:1) Suppressor gene (13:3) Additive gene (9:6:1) Dominant epistasis (12:3:1) Recessive epistasis (9:3:4) Alleles’ interaction Incomplete …

Read More »

Organogenesis

Organogenesis

Organogenesis The main objective in plant cultures is to regenerate a plant or plant organ from the callus culture. The regeneration of plant or plant organs only taken place by the expression of cellular totipotancy of the callus tissues. Scattered areas of actively dividing cells, known as meristematic centres, develop …

Read More »

Biotic and abiotic stress

In the environment, plants are constantly being exposed to a number of adverse conditions. Being immobile and deprived of highly specialized immune system, they have developed intricate mechanisms to adapt and survive under various types of abiotic and biotic stresses. Abiotic Stresses Water Stress One of the most important abiotic …

Read More »

Classes of improved seed

Classes of seed

A) Nucleus seed: It is the initial seed of an improved variety which is always limited in quantity  It is produced by the originating plant breeder Purity – It is genetically and physically cent percent pure  Certification – exempted from certification by seed certifying agency but should be certified by …

Read More »
error: Content is protected !! Dont copy
Whatsapp