Net Notes

repetitive DNA-Tandem repeat: Minisatellite A minisatellite is a section of DNA that consists of a short series of bases 10–60bp.Minisatellites" consist of repetitive, generally GC-rich, variant repeats that range in length from 10 to over 100 bp. These variant repeats are tandemly intermingled, which makes minisatellites ideal for studying DNA turnover mechanisms. Satellite DNA Satellite DNA consists of highly repetitive DNA, and is so called because repetitions of a short DNA sequence tend to produce a different frequency of the nucleotides adenine, cytosine, guanine and thymine, and thus have a different density from bulk DNA - such that they form a second or 'satellite' band when genomic DNA is separated on a density gradient Microsatellite Microsatellites, Simple Sequence Repeats (SSRs), or tandem repeats, are repeating sequences of 1-6 base pairs of DNA Microsatellites are typically neutral and co-dominant. They are used as molecular markers in genetics, for kinship, population and other studies. They can also be used to study gene duplication or deletion.

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Interrupted genes:

Interrupted genes: Genes whose coding sequence is interrupted at intervals by long stretches of non-coding sequences. The coding regions came to be known as exons and the non-coding regions as introns. This structure is now found to be characteristic of most eukaryotic genes. The number and size of introns vary greatly, and they are often much longer than the coding sequences. After transcription, the intron regions are removed, or spliced out form the RNA transcript before it is translated into protein.

Sweet potatoes are large, sweet-tasting, starchy, tuberous roots that are eaten as a vegetable. Flesh of the sweet potato is mainly starch, some protein, and vitamins A and C; flesh can be yellow, orange, or purple. Leaves are edible, and rich in protein and vitamins.

Sweet potatoes are warm-weather vegetables that require a long frost-free growing season. They are perennial vines with heart-shaped leaves, sometimes grown as ivy, and ground cover, and adaptable to container-growing and hanging baskets. Flowers are of medium size.

Sweet potatoes should be planted when there is no chance for frost. Propagation is from slips, which are produced from roots, and from cuttings. Sweet potatoes require at least one inch of uniform watering per week, which should water soil to six inches deep. Allowing roots to dry out and then watering causes cracking of sweet potatoes. Watering in the morning reduces the chance of diseases. Disease and insects are not usually problems and can be limited by crop rotation. Sweet potatoes are usually ready for harvest in 120 days. Care must be taken not to damage or bruise fragile skins.