Tag Archives | Genetic Engineering

Killer Trait in Paramecium | Genetics

Sonneborn in 1938 discovered certain strains in Paramecium which showed a killer trait due to the presence of a cytoplasmic factor called kappa. The killer strain can destroy the sensitive strains growing in culture which do not have kappa by liberating a toxic substance paramecin. Killer strains are not killed by their own paramecin. Paramecium has two kinds of nuclei, [...]

By |2016-12-12T07:24:42+00:00December 12, 2016|Paramecium|Comments Off on Killer Trait in Paramecium | Genetics

Presence of DNA in Mitochondria and Chloroplasts | Genetics

In this article we will discuss about the presence of DNA in mitochondria and chloroplasts. The presence of organelle-specific DNA in mitochondria and chloroplasts was identified with certainty over three decades ago. The occurrence of a specific chloroplast DNA was first demonstrated by Chun et al. in 1963, and of mitochondrial DNA a year later by Luck and Reich (1964). [...]

By |2016-12-12T07:24:41+00:00December 12, 2016|DNA|Comments Off on Presence of DNA in Mitochondria and Chloroplasts | Genetics

Male Sterility in Plants | Genetics

The failure of pollen formation results in male sterile plants. In some crop plants male sterile mutants occur in which inheritance of male sterility follows one of the following two patterns: those in which the trait is inherited through a single recessive chromosomal gene segregating in Mendelian ratios; secondly, those that show maternal transmission. Rhoades in 1933 described maternal inheritance [...]

By |2016-12-12T07:24:41+00:00December 12, 2016|Plants|Comments Off on Male Sterility in Plants | Genetics
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