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#31
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apple seedlings
"P van Rijckevorsel" wrote in message ...
No. You either have a bad book (not sure if they exist) or you read wrong. Try a new book. Solomon, Eldra Pearl, et al. Biology. 3rd edition. Sunders, Forth Worth, 1993. Page 233: "If genes occupy the same locus on each of a pair of chromosomes, they are said to be alleles." They use the expression "not allelic" otherwise. I understand "allele" as "sister", except for genes. |
#32
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apple seedlings
Mihai Cartoaje schreef
Solomon, Eldra Pearl, et al. Biology. 3rd edition. Sunders, Forth Worth, 1993. Page 233: "If genes occupy the same locus on each of a pair of chromosomes, they are said to be alleles." + + + That is somewhat cryptic, and can indeed be misread. However, with a little effort, it can also be read correctly. What they apparently aim to say is that when a particular bit of the DNA codes for a hereditary property (is a gene), then when you look at the same locations on other specimens of this particular chromosome (the same locus), [they forget to mention that these bits should differ enough in the sequence of the bases for it to be reflected in the expression of this hereditary property, when they get the chance] then these bits are called alleles. I guess you should look at the accompanying drawing, or look in a book that has such a drawing. The use of "genes" here is slightly idiosyncratic. Also, they should perhaps have been a little more emphatic that alleles are form of a gene. Also, the "pair of chromosomes" is limiting this to a too restricted, and not necessarily relevant, subclass of this set. I suppose they do this to keep thing simple, but they fail. I would almost think that schoolbooks in the US are as bad as people say, but of course the sample is much too small to draw conclusions. Again, find a book with better pictures. PvR They use the expression "not allelic" otherwise. I understand "allele" as "sister", except for genes. |
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