Genetics

Translation takes place on ribosomes; indeed, ribosomes can be thought of as moving protein-synthesizing machines. A ribosome attaches near the 5′ end of an mRNA strand and moves toward the 3′ end, translating the codons as it goes. Synthesis begins at the amino end of the protein, and the protein …

The process of transcription is very similar in prokaryotes and eukaryotes, but there are major differences in the relation between the transcript and the mRNA used for polypeptide synthesis in eukaryotes. In prokaryotes, the immediate product of transcription (the primary transcript) is mRNA; by contrast, the primary transcript (also called …

The four bases in DNA – A, T, G, and C are sufficient to specify the 20 amino acids in proteins because each codon is three bases in length. Each sequence of three adjacent bases in mRNA is a codon that specifies a particular amino acid (or chain termination). The …

Transcription is the synthesis of RNA molecule using one of the DNA strands as a template. It is the first step in the transfer of genetic information from genotype to phenotype. However, this process of transcription is a highly selective one i.e definite genes are transcribed only when their products …

Every cell of an organism possesses all the structural genes or cistrons. The genes produce proteins and control the activities of the organism. But a genetic system doesn’t allow them to function all at a time in order to avoid enzymatic chaos. Many gene products are only needed occasionally by …

This part of the series named ‘Difference Between’ contains the difference between the following topics of the course ‘The Principles of Crop Improvement’. From syllabus Topic 1: Self incompatibility and cross incompatibility Protandry and Protogyny Self incompatibility (SI) and Coss incompatibility (CI) Gametophytic SI and Sporophytic SI Self incompatibility and …

The male sterility which  is governed by both nuclear and cytoplasmic genes is known as Cytoplasmic Genetic Male Sterility or CGMS. While CMS is controlled by an extra-nuclear genome, nuclear gene may have the capability to restore fertility. When nuclear restoration of fertility genes (“Rf”) is available for a CMS …

Male sterility, as the name indicates, is the inability of a plant to produce a male reproductive organ, the viable pollen. Male sterility can occur due to extra-nuclear genetic or nuclear genetic conditions. Cytoplasmic Male Sterility (CMS) refers to the inability of a plant to produce viable pollens due to …

Genes are the carriers of all the information of an organism. These information are needed for different protein synthesis at different time. So expression of gene can effect an organism’s characteristics, health and so on. As gene expression is a very important feature for any organism as well as for …

Genetic male sterility (GMS) Genetic male sterility is controlled by some nuclear genes called Male Sterile genes. It has been evident that this type of sterility is usually maintained by recessive genes (barley, mustard, pigeon pea, paddy) and less frequently by dominant genes (safflower). The male sterile allele is m …