The Genetic Code Instructions storehouse/mix and match
Inside the nucleus there is a small molecule called DNA (deoxyribonucleic acid) this carries the instruction to make parts, and all the characteristics of a human being.
The DNA molecule is in long thin strands, the strands are in pairs and two strands are joined by cross links like the steps in a ladder. The strands are also coiled in a double spiral (double helix) these strands are the chromosome and small sections of it are known as genes.
When egg and sperm unite (fertilization), these characteristics in the two cells are pooled, and the characteristics of the offspring will be, from those received from both the parents.
How genes are passed on
Apart from the sex chromosomes, all other 44 come in pairs.
In every pair, both chromosomes give instructions for the same characteristic,, the same features are coded for by genes in the same place on each chromosome, called the gene locus. So you have two alternative instructions for each feature.
Some chromosomes may carry many genes, called polygene, to code for a single feature.
Most features are a mix of the two sets of instructions. But with some, there can be no alternative - one or the other must win. The gene that wins is said to be 'dominant'; the loser is 'recessive.'
Any questions be sent to drmmkapur@gmail.com
All earlier posts are stored in archives for your access and review.
Visitor that follow the site may post contributions to the site.
For provider/consumer convergence visit www.surgseminar.blogspot.com
www.otmanage.blogspot.com
Click on image to see detail
Inside the nucleus there is a small molecule called DNA (deoxyribonucleic acid) this carries the instruction to make parts, and all the characteristics of a human being.
The DNA molecule is in long thin strands, the strands are in pairs and two strands are joined by cross links like the steps in a ladder. The strands are also coiled in a double spiral (double helix) these strands are the chromosome and small sections of it are known as genes.
When egg and sperm unite (fertilization), these characteristics in the two cells are pooled, and the characteristics of the offspring will be, from those received from both the parents.
How genes are passed on
Apart from the sex chromosomes, all other 44 come in pairs.
In every pair, both chromosomes give instructions for the same characteristic,, the same features are coded for by genes in the same place on each chromosome, called the gene locus. So you have two alternative instructions for each feature.
Some chromosomes may carry many genes, called polygene, to code for a single feature.
Most features are a mix of the two sets of instructions. But with some, there can be no alternative - one or the other must win. The gene that wins is said to be 'dominant'; the loser is 'recessive.'
Any questions be sent to drmmkapur@gmail.com
All earlier posts are stored in archives for your access and review.
Visitor that follow the site may post contributions to the site.
For provider/consumer convergence visit www.surgseminar.blogspot.com
www.otmanage.blogspot.com
Click on image to see detail
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