Last edited by Togore
Thursday, July 23, 2020 | History

2 edition of sexual cycles of vertebrates. found in the catalog.

sexual cycles of vertebrates.

John Francis Deryk Frazer

sexual cycles of vertebrates.

by John Francis Deryk Frazer

  • 256 Want to read
  • 31 Currently reading

Published by Hutchinson University Library in London .
Written in English

    Subjects:
  • Reproduction.,
  • Vertebrates.,
  • Sex (Biology)

  • Edition Notes

    Bibliography: p. 155-156.

    Series[Hutchinson University Library]: Biological sciences
    Classifications
    LC ClassificationsQP251 .F7
    The Physical Object
    Pagination168 p.
    Number of Pages168
    ID Numbers
    Open LibraryOL217942M
    LC Control Numbera 60002529
    OCLC/WorldCa554935

    Amphibians are vertebrate tetrapods. Amphibia includes frogs, salamanders, and caecilians. The term amphibian means “dual life,” which is a reference to the metamorphosis that many frogs undergo from a tadpole to an adult and the mixture of aquatic and terrestrial environments in their life cycle. In the sexual reproductive cycle, haploid generations of cells, each carrying a single set of chromosomes, alternate with diploid generations of cells, each carrying a double set of chromosomes (Figure ). Genomes mix when two haploid cells fuse to form a diploid cell. Later, new haploid cells are generated when a descendant of this diploid cell divides by the .

    Fish reproductive organs include testes and most species, gonads are paired organs of similar size, which can be partially or totally fused. There may also be a range of secondary organs that increase reproductive fitness. The genital papilla is a small, fleshy tube behind the anus in some fishes, from which the sperm or eggs are released; the sex of a fish often can be . Reproduction and development of sexual characteristics in vertebrates is controlled directly by the hormones produced in the gonads, estrogens, progesterone and testosterone. Initially of course it is the genetic makeup of the individual that determines sex. Most vertebrates have a pair of chromosomes which are not identical (sex chromosomes).

    Science is all about classification, and the animal kingdom has two basic groups: those without backbones, invertebrates, and those with backbones, vertebrates. Invertebrates Some animals, like humans, have backbones, but many others do g: sexual cycles. Textbook of Zoology Vertebrates. Authors (view affiliations) T. Jeffery Parker; William A. Haswell; Textbook. 12 Citations; 1 Mentions; k Downloads; Chapters Table of contents (13 chapters) About About this book; Table of contents. Search within book. Front Matter. Pages i-xxiii. PDF. Phylum Chordata. T. Jeffery Parker, William A. Haswell Missing: sexual cycles.


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Sexual cycles of vertebrates by John Francis Deryk Frazer Download PDF EPUB FB2

The Sexual Cycles of Vertebrates [J.F.D. Frazer] on *FREE* shipping on qualifying : $ It is the purpose of this book to present a brief but up-to-date account of our knowledge of the sexual physiology of the vertebrates.

During the past generation a whole library has been written around this subject, and therefore in such small space it is impossible to do more than introduce the main facts and theories. The sexual cycles of vertebrates.

[John Francis Deryk Frazer] Home. WorldCat Home About WorldCat Help. Search. Search for Library Items Search for Lists Search for SECycles-Book Titles_4 ( items) by bstatton updated Confirm this request.

You may have already requested this item. Book: The sexual cycles of vertebrates. pp pp. Abstract: The subject of sexual cycles is extensive. The author has necessarily had to deal with many different planes of reference, and he has been at pains to draw together the necessary facts and arguments from the fields of anatomy, comparative zoology, embryology embryology Subject Category: Cited by: 2.

Additional Physical Format: Online version: Bullough, William Sydney, Vertebrate sexual cycles. London, Methuen; New York, Wiley [] (OCoLC) The cycles of reproduction in all the domestic animals and birds as well as in many wild species are dealt with sexual cycles of vertebrates.

book this little book. The subject is discussed under the headings: Cycles of reproduction; Environment and reproduction; Hormones and reproduction; and Sexual behaviour. In addition there are a glossary of terms, a list of species mentioned, a list of references and.

The female reproductive system of amphibians, as in most vertebrates, consists of paired ovaries and oviducts. The system changes seasonally in accordance with the reproductive cycle.

The neuroendocrine systems influence the functions of the ovaries. The ovaries produce steroids, which control the oviductal changes. The cyclic reproductive events of female mammals are referred to as the estrous cycle and include a short period of heightened receptivity of the female for mating, which is called estrus.

The roles of hormones and paracrines during the ovarian cycle are separatedduring the follicular phase, ovulation, and the luteal phase. GCs are normally maintained in the blood at relatively low levels that fluctuate on circadian and circannual cycles to regulate energy availability and use.

As the level of challenge increases, the hypothalamus upregulates the hormone cascade, resulting in further release of GCs from the adrenal gland into the plasma. From a review of available data, it is clear that gonadal steroid profiles across the reproductive cycle and their hypothalamic–pituitary regulation have remained generally consistent across lizard species regardless of reproductive mode (e.g., oviparity vs.

viviparity, genotypic vs. temperature-dependent sex determination (TSD)). Sex in fishes is determined by genetically or environmentally based signals. The second vertebrate sex-determining gene, dmy/dmrt1by, was discovered in medaka (Oryzias latipes) but was found to be present only in two Oryzias species, illustrating the vast diversity of sex-determining genes in fishes.

Data accumulated from these species would be. The human sexual response cycle is a four-stage model of physiological responses to sexual stimulation, which, in order of their occurrence, are the excitement- plateau- orgasmic- and resolution phases. This physiological response model was first formulated by William H.

Masters and Virginia E. Johnson, in their book Human Sexual Response. Since then, other human sexual response Missing: vertebrates. A Text Book of Vertebrate Zoology Item Preview remove-circle Graphic Sexual Content ; texts. A Text Book of Vertebrate Zoology by J.S. Kingsley. Publication date Topics zoology, taxonomy, biology, vertebrate, morphology Publisher Henry Holt & Co.

Collection. The online version of this work is available exclusively on SciVerse ScienceDirect. This online work provides the breadth and depth of content Elsevier is known for and also offers a great deal more when it comes to flexibility, accessibility, and most importantly, usability.

Life Cycles. Sexual reproduction occurs in a cycle. Diploid parents produce haploid gametes that unite and develop into diploid adults, which repeat the cycle.

This series of life stages and events that a sexually reproducing organism goes through is called its life cycle. Sexually reproducing organisms can have different types of life cycles. The Reproduction of Vertebrates describes the vertebrate reproductive systems in an evolutionary sequence and according to taxonomic classes.

This book is divided into seven chapters; each chapter tackles a specific vertebrate class. This text specifically considers fish, amphibians, reptiles, birds, mammals, and man.

In this live Grade 12 Life Sciences show we take a look at Reproduction in Vertebrates. In this lesson we review the schematic outline of the human life cycle to show the role of meiosis, mitosis and fertilisation. We define sexual and asexual reproduction, copulation & fertilisation.

Search the world's most comprehensive index of full-text books. My libraryMissing: sexual cycles  vertebrates. Classifying Animals into Vertebrates and Invertebrates - Animal Book for 8 Year Olds | Children's Animal Books. by Baby Professor | out of 5 stars 2.

Paperback $ $ 53 $ $ FREE Shipping on orders over $25 shipped by Amazon. Usually ships within 2 Missing: sexual cycles. In this Grade 12 Life Sciences live show we take a look at Reproduction (Life Cycles, Asexual & Sexual). In this lesson we define reproduction in terms of sexual & asexual reproduction.

We compare asexual and sexual reproduction. We also look at Life Cycles with regards to alternation of generations as well as haploid and diploid states. As such, they complete their life cycle in two hosts. This cycle consists of both sexual and asexual cycles that occur in the vector/mosquito and vertebrate respectively.

Given that all malaria parasites are digenetic, the life cycle of P. falciparum will be used to describe the general life cycle of plasmodium in this section.species have complex life cycles with alternation of sexual and asexual stages. – Many require an intermediate host in which the larvae develop before infecting the final hosts (usually a vertebrate) where the adult worm lives.

– The fluke Schistosoma infects million people. • The blood fluke Schistosoma infects million people.Reproduction - Reproduction - Life cycles of animals: Invertebrate animals have a rich variety of life cycles, especially among those forms that undergo metamorphosis, a radical physical change.

Butterflies, for instance, have a caterpillar stage (larva), a dormant chrysalis stage (pupa), and an adult stage (imago). One remarkable aspect of this development is that, during the .