The Scientific Monthly, Tom 7James McKeen Cattell American Association for the Advancement of Science, 1918 |
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Strona 39
... species there is no irresistible im- pulse to gorge itself with blood and usually the mature form never feeds . The eggs are laid in rows in a gelatinous sack which is attached to some object at the surface of flowing water . Each sack ...
... species there is no irresistible im- pulse to gorge itself with blood and usually the mature form never feeds . The eggs are laid in rows in a gelatinous sack which is attached to some object at the surface of flowing water . Each sack ...
Strona 46
... SPECIES AS GROUPS OF GENES One of the most interesting ideas that De Vries brought forward in his mutation theory was that groups of " small species " or of varieties are made up of many common genes and differ in a relatively small ...
... SPECIES AS GROUPS OF GENES One of the most interesting ideas that De Vries brought forward in his mutation theory was that groups of " small species " or of varieties are made up of many common genes and differ in a relatively small ...
Strona 47
... species have many genes in common they may be expected to produce at times the same mutants . In fact , it is not at all uncommon to find even in Mendelian literature such forms as albinos spoken of as though they represent the same ...
... species have many genes in common they may be expected to produce at times the same mutants . In fact , it is not at all uncommon to find even in Mendelian literature such forms as albinos spoken of as though they represent the same ...
Strona 48
... species of the genus Drosophila . In a species , D. virilis , he has had 12 mu- tants appear and these fall into three groups of linked genes . Three of them , yellow , forked and confluent , resemble externally characters of D ...
... species of the genus Drosophila . In a species , D. virilis , he has had 12 mu- tants appear and these fall into three groups of linked genes . Three of them , yellow , forked and confluent , resemble externally characters of D ...
Strona 49
James McKeen Cattell. Unless such species can be crossed the only convincing evidence that we can hope to get will be to ... species , it would follow that decreases in this amount are more likely to happen than increases , hence the VOL ...
James McKeen Cattell. Unless such species can be crossed the only convincing evidence that we can hope to get will be to ... species , it would follow that decreases in this amount are more likely to happen than increases , hence the VOL ...
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