Piebald Rats And Selection An Experimental Test of the Effectiveness of Selecti
Piebald Rats And Selection An Experimental Test of the Effectiveness of Selecti
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The mean of the plus race was lowered a very little by a cross with wild rats, but considerably by a cross with the Irish race.
DISCUSSION.
It Y\^ould be possible to suppose, as the senior author has elsev/here suggested (Castle, 1912), that the Mendelian unit character involved in these experiments is subject to quantitative variation and that such quantitative variations have a tendency to persist from generation to generation. This would account for the effectiveness and permanency of select...ion when brought to bear upon the variations. It might also form a basis for explaining the increased variability which follows cross- ing, this being regarded as due to contamination in the heterozygote, but there are certain other observed effects of crossing which it seems impos- sible to account for on this basis. In particular it is observed that while crossing the minus series makes it less minus as the hypothesis of con- tamination would demand, crossing the plus series makes it less plus, the opposite of what a contamination theory would demand.
What to read after Piebald Rats And Selection An Experimental Test of the Effectiveness of Selecti?
You can find similar books in the "Read Also" column, or choose other free books by William E William Ernest Castle to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The mean of the plus race was lowered a very little by a cross with wild rats, but considerably by a cross with the Irish race.
DISCUSSION.
It Y\^ould be possible to suppose, as the senior author has elsev/here suggested (Castle, 1912), that the Mendelian unit character involved in these experiments is subject to quantitative variation and that such quantitative variations have a tendency to persist from generation to generation. This would account for the effectiveness and permanency of select...ion when brought to bear upon the variations. It might also form a basis for explaining the increased variability which follows cross- ing, this being regarded as due to contamination in the heterozygote, but there are certain other observed effects of crossing which it seems impos- sible to account for on this basis. In particular it is observed that while crossing the minus series makes it less minus as the hypothesis of con- tamination would demand, crossing the plus series makes it less plus, the opposite of what a contamination theory would demand.
What to read after Piebald Rats And Selection An Experimental Test of the Effectiveness of Selecti?
You can find similar books in the "Read Also" column, or choose other free books by William E William Ernest Castle to read onlineMoreLess
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