Evolution And Animal Life An Elementary Discussion of Facts Processes Laws An
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On the upper side pigment cells develop, w^hile on the low^er side they remain ^H. F. Osbom, ''Evolution and Heredity, " Wood's HoU Biological j^eutures, 1890.
Inheritance of acquired characti^rs 201 imperfect. However, in a flounder reared under conditions in which the hght falls on the lower side, pigment cells are de- veloped also on til at side.
It has been claimed by certain writers, as Cunningham, that the twisting of the head in the flounder is due to tlie inheritance of an acquired char...acter. A flat fish without air bladder, rest- ing on the sea bottom, naturally falls on one side. The eye thrust into the sand is naturally twisted around to the upper side, and +his tendency begun in very young individuals becomes hereditary, while the lack of pigment on the under side is also transmitted by inheritance. But it is just as easy lo claim that the first trait of adaptation is due to natural selection, and that the whiteness of the blind side is ontogenetic, due to the absence of light in the growth of the individual.
What to read after Evolution And Animal Life An Elementary Discussion of Facts Processes Laws An?
You can find similar books in the "Read Also" column, or choose other free books by Jordan David Starr to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
On the upper side pigment cells develop, w^hile on the low^er side they remain ^H. F. Osbom, ''Evolution and Heredity, " Wood's HoU Biological j^eutures, 1890.
Inheritance of acquired characti^rs 201 imperfect. However, in a flounder reared under conditions in which the hght falls on the lower side, pigment cells are de- veloped also on til at side.
It has been claimed by certain writers, as Cunningham, that the twisting of the head in the flounder is due to tlie inheritance of an acquired char...acter. A flat fish without air bladder, rest- ing on the sea bottom, naturally falls on one side. The eye thrust into the sand is naturally twisted around to the upper side, and +his tendency begun in very young individuals becomes hereditary, while the lack of pigment on the under side is also transmitted by inheritance. But it is just as easy lo claim that the first trait of adaptation is due to natural selection, and that the whiteness of the blind side is ontogenetic, due to the absence of light in the growth of the individual.
What to read after Evolution And Animal Life An Elementary Discussion of Facts Processes Laws An?
You can find similar books in the "Read Also" column, or choose other free books by Jordan David Starr to read onlineMoreLess
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