Crossing Over
Crossing Over Crossing over may be defined as the recombination of linked genes brought as a result of interchange of corresponding parts between the chromatid of a homologous pair …
Category: Biology
Linkage
Linkage The phenomenon of inheritance of genes together and to retain their parental combination even in the offspring is termed as linkage. Mendel’s principle of independent assortment shows exception. …
Pleiotropy and Polygenic Intheritance
Pleiotropy Genes that affect multiple, apparently unrelated phenotypes, are termed as pleiotropic genes and the phenomenon is termed as pleiotropy. The term pleiotropy is derived from the Greek word …
Blood Groups
Blood Groups Blood group is inheritable. ABO blood system in humans is triallelic system that generates six genotypes. The loss of blood due to accident or disease creates blood …
Epistasis and Supplementary Gene
Epistasis Epistasis is the phenomenon where the effect of one gene (locus) is dependent on the presence of one or more ‘modifier genes’. Any gene or gene pair that …
Incomplete Dominance and Co-Dominance
Incomplete Dominance and Co-Dominance Incomplete Dominance It is a form of intermediate inheritance in which one allele for a specific trait is not completely expressed over its paired allele. …
Heredity and Variations
Heredity and Variations The transmission of characters from parents to the offspring is termed as heredity. The gametes act as vehicles of hereditary transmission. However, not all offsprings are …
Noise Pollution
Noise Pollution Noise pollution is unwanted, unpleasant, loud disturbing sound that has a harmful effect on human beings as well as animals. The frequency of sound is measured in …
Soil Pollution
Soil Pollution Soil pollution is the alteration in soil due to the removal or addition of substances, which decreases the productivity and quality of plants. Agrochemicals, industrial wastes, mining …
Water pollution
Water pollution Water pollution is the contamination of water due to the addition of substances (i.e.,inorganic, organic, biological, radiological,etc.,) making it unfit for human use and growth of aquatic …