Every zygote after conjugation or fertilisation may be said to be bisexual or hermaphrodite.
The zygote therefore, whether the sex of it is determined as male or female, has the same factor for the development of milk glands.
Every zygotemust have the same composition, and yet give rise to two sexes in the same individual.
We may suppose that the zygote contains both sexes, one or other of which is dominant, and that dominance of one primary sex involves dominance of the corresponding sexual characters.
In this case, therefore, we have what Bateson was seeking, the origin of a new dominant character under observation, the original mutation having arisen in a single gamete of the zygote which gave rise to the plant.
Abnormal Specimen Of Turbot] I have suggested that the explanation here is that in the zygote the primordia of a normal body and a reversed head have been united together.
Heredity thus continues from gamete to gamete, not from zygote to soma, and then from soma to gamete.
But strictly speaking they ARE acquired characters, for the zygote at first has none of the characters which it subsequently acquires, but only the power of acquiring them in response to the action of the environment.
Looked at from one point of view they belong to the class of genetic variations, which depend upon the structure or constitution of the protoplasm; but instead of appearing in different zygotes (A zygote is a fertilised ovum, i.
Zygote in the motile stage (vermicule or ookinete).
The zygote or sporont is at first capable of movement and known as an ookinete.
The actual conjugation is quite similar to the process in Coccidia, and the resulting zygote perfectly homologous.
This is in consonance with the facts already mentioned that zoospores germinate forthwith, and that the sexually-produced cell or zygote enters upon a period of rest.
From the union of two such gametes, provided that they are still capable of fertilisation, comes the zygote which in course of growth develops the new character.
But the qualities themselves remain unchanged in so far as the gamete is concerned, since the gamete pays no heed to the intellectual development of the zygote in whom he happens to dwell.
What is the relation between gamete and zygote, between zygote and gamete?
Heredity, on the other hand, deals with the {183} transmission of something intrinsic from gamete to zygote and from zygote to gamete.
Of the eight different kinds of zygoteformed only one contains P in the absence of I, and this is a female.
Neither is there any reason for supposing that the superior education of a {182} mathematicalzygote will thereby increase the mathematical propensities of the gametes which live within him.
All these things are but the transfer from zygote to zygote of something extrinsic to the species.
Nevertheless, upon the gamete depend those inherent faculties which enable the zygote to profit by his opportunities, and, unless the zygote has received them from the gamete, the advantages of education are of little worth.
There exists repulsion between the factors G and F in a zygotewhich is heterozygous for them both.
But the problem of the way in which characters are distributed from gamete tozygote and from zygote to gamete remained as before.
This means that the zygote or fertile ovum contains double the number of chromosomes possessed by either gamete, and that, moreover, each tissue-cell of the new individual will contain this dual number.
It is through a series of such divisions as these that the zygote or fertilized egg-cell builds up the tissues and organs of the new organism.
Fission of Zygote nucleus into two, the new mega- and micronucleus whose differentiation is shown in 11, 12.
Why, when a gamete with the median element unites with a gamete without that element, does the zygote develop a soma that in some cases shows a nine-tenths median and sometimes a one-tenth median element?
We find, in general, that the determiner of a well-developed organ dominates in the zygote over the determiner of a slightly developed condition of that organ or its obsolete condition.
It is as though there were in the zygote an interaction between the strong and the weak form of the determiner, and the strong won; but sometimes the victory is imperfect.
As in the case of so many other forms of matter, the more important properties of the zygotedo not become apparent until it is submitted to the action of external forces.
In Echinus, for instance, the two pronuclei fuse, and the spindle and chromosomes are formed from the zygote nucleus, whereas in the mouse the two pronuclei retain their distinctness during the formation of the chromosomes.
Or does it depend upon the conditions to which the zygote is subjected in its development?
The first change the zygote undergoes in all animals is what is generally called the segmentation or cleavage of the ovum.
If this is true, the centrosome of the zygote nucleus must be entirely derived from that of the male pronucleus.
The sporoblast or gamete thus formed is completely isogamous and normally conjugates with the like one from the other associate, when a single zygote results which becomes a spore containing eight sporozoites, in the ordinary manner.
The result of the copulation is a resting zygospore (also calledzygote or oospermo or fertilized egg), which after a time develops itself into one or more new colonies.
IX, X, show the formation of the zygote by fusion of the nuclei of the gametes.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "zygote" in a variety of sentences. We hope that you will now be able to make sentences using this word.
