168 results found

This presentation explains the differences between Phenotype and genotype. Explains the different types of genotypes that exist: dominant homozygous genotype, genotype recessive homozygous and heterozygous genotype. After extensively explain other concepts of Mendelian genetics. It explains the monohibrido crossing, intermediate inheritance, ...

Video describing how a proto-oncogene can become transformed into an oncogene. The single nucleotide change can make this process and this explains the process by which a cell can become cancerous. Other cells can become cancerous due to chromosomal translocation occurs.

Good video that explains through animation as exchange occurs between homologous chromosomes sections. Recombination endonuclease mixture begins when a strand of DNA with another of a homologous chromosome, a strand of DNA invades the homologous chromosome and unwinds. REC proteins in bacteria cut the invaded zone which facilitates the pairing. ...

Simple video which explains why there is sexual reproduction, why sexual reproduction prevails over asexual and how important is a level of evolution.
With a concrete example shows how to evolve the face of adversity organisms that reproduce asexually and sexually reproducing, concluding that sex always wins.

Description of the 5 stages of the cell cycle (G1, S, G2, M and G0).

Go is the phase where the cell remains indefinitely until the cell cycle begins again, as long as the cells for this step depends on cell type. In the Interface (G1, S, and G2) the cell prepares for division replicating DNA, many phenomena of synthesis and replication occur ...

Basic but good video to explain DNA transcription.
Transcription is the synthesis of RNA from DNA. In eukaryotes begins with the binding of RNA polymerase to DNA in a region called the promoter. DNA separates and begins the insertion of ribonucleotides and messenger RNA synthesis. When you have transcribed about 30 nucleotides 7metil adds a ...

Video explaining the importance of meiosis.

Although no difference in the different phases of the same, if you highlight the mechanisms by which genetic variation occurs as crossing-over and random segregation of homologous chromosomes.

The result of meiosis is that of a diploid cell produces 4 haploid cells with a single chromatid.

Video explaining generally that are mutations as they occur. Difference between the consequences depending on if they occur in somatic cells in sex.

Good presentation that explains how to form a chromosome and techniques exist for analysis. From here, images and examples explained by the different types of chromosomal abnormalities. Numerical abnormalities, aneuploidy and polyploidy. Structural abnormalities: translocation, deletion, insertion, inversion, rings and isochromosomes.

Good video showing in brief the process of replication. The DNA molecule is opened by the helicase, SSB proteins bind to DNA to prevent renaturalice and replication begins. In a fiber made in 5'-3 'on an ongoing basis and through the DNA Polymerase III. By contrast, in the other direction to make it in 5'-3 'has to be replicated discontinuously ...