ZIN MECHANISM
rubabThis type of sex — determination pattern is common in birds. butterflies and moths. It was discovered by .1. Seiler in 19 14 in 1110111. It is the reverse of…
XY – MECHANISM
This pattern of sex determim tion is round in Drosophila, man and many other organisms. (a) Male: Male is XY. Mite is heterogametic. It produces two types of sex-determining sperms.…
MECHANISM OF ABSORPTION OF WATER
sanaWATER Absorption: of water*, root hairs: .[he absorption of \safer from the soil takes place tlitimigh the root hairs. Ihe root hairs are in contact with the wateriilms on the…
Classification system of Carolus Linnaeus
sidraThe classification system of Linnaeus was based on floral characteristics. He chiefly used characters of stamen's. Therefore, his system is called sexual system. This system is very convenient for the…
PLASMA MEMBRANE
abidaThe plasma membrane surrounds the cell. Chemically plasma membrane is composed of: Protein: 60 to 80% Phospholipids: 20 to 40 % Cholesterol in small amount Carbohydrates in small amount Fig:…
XO MECHANISM
The sex determining mechanism in which sex is determined by In X chromosome only is called X() mechanism. This pattern of sex determination is found in grasshopper and protenor bug.…
SEX DETERMINATION
The chromosomes which determine sex in the different organisms are called sex chromosomes. 'Fhe term -sex- refers to the processes that enable species to exchange materials between homologous chromosomes. Ii…
CELL, TISSUES 0 GAN 14 ORGAN SYSTEM OF ANIMAL
CE L All animals are made up of cells. The cell plays a fundamental role in the understanding of zoology. It also helps in the understanding of chemistry. Cell is…
Anatomy of Root – Types of tissues in root
Root has following types of tissues: Side: The vascular tissue and the pericycle form a tube of conducting cells called stele. Xvlems are present in the centre of the root.…
Sex Linkage in Man
Colour Blindness Color blindness, or color vision deficiency, in humans is the inability to differentiate between som or all colors that other people can distinguish. It is most often of…