Define Fertilization In Biology. In angiosperms, fertilization results in two structures, namely, zygote and endosperm, hence the name “double fertilization.” double fertilization is a complex process where out of two sperm cells, one fuses with the egg cell and the other fuses with two polar nuclei which result in a diploid (2n) zygote and a triploid (3n) primary endosperm nucleus (pen) respectively. Fertilization is defined as fusion of male and female gametes.

The sex and other biologic traits of the new individual are determined by the combined genes and chromosomes that exist in the sperm and oocyte. In this online lecture, sir usama qamar explains 10th class biology chapter 14 reproduction. Fertilization, simply, is the joining of an egg and a sperm.

Define Crossing Over Biology. In prophase i, homologous chromosomes align lengthwise or pair with each other, and exchange of genetic material between the two chromosomes takes place, which is known as crossing over. Such chromosomes are alike in appearance and it is not possible to distinguish between them in microscope.

A process in which homologous chromosomes exchange parts normally reciprocally but sometimes unequally. It is one of the reasons why each of us is unique. The exchange of genetic material between homologous chromosomes that occurs during meiosis and contributes to genetic variability.

What Is Cohesion In Biology. Sets found in the same folder. Cohesion is caused by interactions between the same sort of molecules.

Cohesion force is rampant among water molecules. The tendency of water molecules to stick together is referred to as cohesion and they are held together by a cohesive force such as an intermolecular hydrogen bond. Cohesion is the act, state, or process of sticking together of alike molecules or entities.