Vietnam or Thailand ? Vote for the TOP Country of the Week !
Updated: May 1, 2025
Similarly, if we suppose that segregation of ovum and sperm occurs in the female, the sperms must disappear and the ovum would contain no factors derived from the male parent. But the theory supposes that the segregation of male and female does occur in the female, that half the ova are female and half are male.
However, it must be said that these generally common conditions do not always obtain that is, they are not true in the case of all women. There are women who will conceive at any time in the month, if they are given a chance to do so. The physiological reason for such possibility is said to be this: There are always ova in the ovaries, in varying stages of development.
Ehrenberg detected the minute germs of vegetable mould, and the ova of some of the smallest animalcules; and when it is considered that these germs and ova are so tenacious of vitality that certain prolific seeds have come down to us from the age of the Pharaohs in the wrappings of the Egyptian mummies, that they are widely diffused in the air and the waters, insomuch that no sooner does a coral reef appear above the level of the sea than it is forthwith covered with herbage by means of seeds wafted by the winds or deposited by the waves, and that it is almost impossible to exclude them by any artificial expedient, since they are capable of resisting the action of boiling water and even of alcohol itself, it cannot, we think, be denied that the few cases which still remain obscure or unexplained may be, at least, probably accounted for in accordance with the same natural law which is found to be invariably established in every department to which our clear knowledge extends.
The teeth get larger at the base, the jaw bone thickens with age, and the snout gets longer. I have often seen trout that have been reared from ova, and whose age was consequently known, and have closely observed their mouths. The fish in your stream grow fast from the great abundance of the food that trout thrive best on."
The desolation of this distant city, with its foreground of squalid hovels, and ill-favoured wine shop and smithies where the very inscriptions, "Vino di Marino," or "Ferracocchio," or "Ova di Giornata," look as if a megalomaniac, escaped from an asylum, had dipped a brush into a paint-pot and splashed all over; this foreground of vague tombs, masonry heaven knows what, all flowered with huge wild mignonette; this other moving background of ragged peasants and unutterable galled horses; the desolation of this dead city which I feel behind those mediæval walls comes home to them, like the sting of the dust whirlpools and roar of the wind.
Of the latter it cannot reasonably be supposed that the ova ever pass through the medium of the air, or through the blood-vessels, for they are too heavy for the one transit, and too large for the other.
Lander asked, "What do you s'pose your folks would say to your goin' to Europe, anyway, Clementina?" as if the matter had been already debated between them. Clementina hesitated. "I should want to be su'a, Mrs. Milray really wanted me to go ova with her." "Why, didn't you hear her say so?" demanded Mrs. Lander. "Yes," sighed Clementina. "Mrs. Lander, I think Mrs.
In the maturation divisions reduction does not occur, N chromosomes passing to one gamete, none to the other, and the latter perishes so that the sperms all contain N chromosomes. When fertilisation occurs the zygote therefore contains 2N chromosomes and becomes female. Here then we have no segregation of Fxf in the ova.
The life-history of the salmon, so far as it concerns the matter in hand, may be very briefly summed up. It is bred in the rivers and fed in the sea. The parent fish ascend in late autumn as high as they can get, the ova are deposited on gravel shallows, hatching out in the course of a few weeks into parr.
The production of the insect, if it did take place as assumed, was as clearly an act of the Almighty himself, as if he had fashioned it with hands. For the presumption that an act of aboriginal creation did take place, there is this to be said, that, in Mr. Weekes's experiment, every care that ingenuity could devise was taken to exclude the possibility of a development of the insects from ova.
Word Of The Day
Others Looking