APAKAH MAKSUD HETEROCHROMOSOME dalam CORSICA?
Sistem penentuan jantina
Sistem penentuan jantina adalah sistem biologi yang menentukan perkembangan ciri-ciri seksual dalam organisma. Kebanyakan organisme seksual mempunyai dua jenis kelamin. Kadang-kadang terdapat hermaphrodit di tempat satu atau kedua jantina. Terdapat juga beberapa spesies yang hanya satu seks kerana parthenogenesis, perbuatan seorang wanita yang tidak menghasilkan persenyawaan. Dalam banyak spesies, penentuan jantina adalah genetik: lelaki dan perempuan mempunyai alel yang berbeza atau gen yang berbeza yang menentukan morfologi seksual mereka. Pada haiwan ini, ia sering disertai dengan perbezaan kromosom, secara umumnya melalui gabungan XY, ZW, XO, kromosom ZO, atau haplodiploidy. Pengelasan seksual biasanya dicetuskan oleh gen utama, dengan banyak gen lain yang mengikuti kesan domino. Dalam kes lain, seks ditentukan oleh pembolehubah persekitaran atau pembolehubah sosial. Penentuan seks alam sekitar didahului dengan sistem genetik yang ditentukan; ia dianggap bahawa amniote bergantung kepada suhu adalah nenek moyang haiwan yang sama dengan kromosom seks. Sesetengah spesies tidak mempunyai seks tetap, dan sebaliknya menukar seks berdasarkan isyarat tertentu.
Definisi heterochromosome dalam kamus Corsica
Takrif heterochromosome dalam kamus adalah kromosom atipikal, esp kromosom seks. Takrifan lain heterochromosome adalah kromosom yang terdiri terutamanya daripada heterochromatin.
CORSICA BUKU YANG BERKAIT DENGAN «HETEROCHROMOSOME»
Ketahui penggunaan
heterochromosome dalam pilihan bibliografi berikut. Buku yang berkait dengan
heterochromosome dan ekstrak ringkas dari yang sama untuk menyediakan konteks penggunaannya dalam kesusasteraan Corsica.
1
Pamphlets on Biology: Kofoid collection
The first division is certainly cquational for three, probably for all, of the
chromosomes, and the second is positively rcductional for the
heterochromosome, and probably for all. The five chromatids which enter the
second division form short ...
2
Sex Itself: The Search for Male and Female in the Human Genome
Nettie Stevens favored “heterochromosome” for the XX/XY type. The term “
heterochromosome” offered the additional advantage, over the term “accessory
chromosome,” of highlighting the commonly observed size differential between
the X ...
Sarah S. Richardson,
2013
3
The Biological Bulletin
The plasmosome is just above heterochromosome group. FIG. 2. Late prophase,
first spermatocyte, spindle formed but nuclear membrane still intact. FIG. 3.
Metaphase plate, first spermatocyte, showing heterochromosome group in center
; ...
Frank Rattray Lillie, Carl Richard Moore, Alfred Clarence Redfield,
1916
4
Memoirs of the University of California
Heterochromosome near upper margin of contraction figure. Case 6. Fig. 20.
Synizesis with the heterochromosome at the lower edge. Case 6. Fig. 21.
Pachynema, beginning of the unraveling. Typical heterochromosome present.
Case 6. Fig.
University of California (1868-1952),
1929
5
A Dictionary of Plant Sciences
In many species, the *Y chromosome is a heterochromosome.
heterochromosome See HETEROCHRO— MATIN. n heterochrony The
dissociation, during the development of factors of shape, size, and maturity, so
that organisms mature in ...
6
Animal Behavior Desk Reference: A Dictionary of Animal ...
A chromosome, or chromosome fragment, with a nearly terminal centromere (
Mayr 1982, 769; King and Stansfield 1985). cf. chromosome: metacentric
chromosome, telocentric chromosome allosome, heterochromosome n. A
chromosome, or ...
7
The 7 Sexes: Biology of Sex Determination
In 1905, Stevens noted the existence of what she called heterochromosomes to
distinguish them from Montgomery's autosomes, or homologous pairs of
chromosomes. There is a distinct heterochromosome found in both males and
females.
8
Essentials Of Human Genetics (Rev)
Also referred to as heterochromosome. Heterochromosome: See
heterochromatin. Heterodisomy: When in a cell both the homologous
chromosomes are derived from a single parent and none mother or the father.
Homologous chromosomes ...
9
The Journal of experimental zoology
heterochromosome pair. 5 = division product of xi. jci larger heterochromosome.
Fig. 1 Nucleus of resting spermatogonium. (H,) Figs. 2 and 3 Spcrmatogonial
equatorial plates, 24 chromosomes. (Ei*) Fig. 4 Spermatogonial equatorial plate,
...
Ross Granville Harrison, William Keith Brooks, Wistar Institute of Anatomy and Biology,
1910
10
Bryn Mawr College Monographs. Reprint Series
7 and 8. Anopheles punctipennis, resting spermatogonia. X =the hetero-
chromosome. Fig. 9. Synizesis stage. Figs. 10-12. Growth stages. Fig. 13.
Prophase. heterochromosome appears as a deeply staining mass of chromatin
resting against ...