• Study Resource
  • Explore Categories
    • Arts & Humanities
    • Business
    • Engineering & Technology
    • Foreign Language
    • History
    • Math
    • Science
    • Social Science

    Top subcategories

    • Advanced Math
    • Algebra
    • Basic Math
    • Calculus
    • Geometry
    • Linear Algebra
    • Pre-Algebra
    • Pre-Calculus
    • Statistics And Probability
    • Trigonometry
    • other →

    Top subcategories

    • Astronomy
    • Astrophysics
    • Biology
    • Chemistry
    • Earth Science
    • Environmental Science
    • Health Science
    • Physics
    • other →

    Top subcategories

    • Anthropology
    • Law
    • Political Science
    • Psychology
    • Sociology
    • other →

    Top subcategories

    • Accounting
    • Economics
    • Finance
    • Management
    • other →

    Top subcategories

    • Aerospace Engineering
    • Bioengineering
    • Chemical Engineering
    • Civil Engineering
    • Computer Science
    • Electrical Engineering
    • Industrial Engineering
    • Mechanical Engineering
    • Web Design
    • other →

    Top subcategories

    • Architecture
    • Communications
    • English
    • Gender Studies
    • Music
    • Performing Arts
    • Philosophy
    • Religious Studies
    • Writing
    • other →

    Top subcategories

    • Ancient History
    • European History
    • US History
    • World History
    • other →

    Top subcategories

    • Croatian
    • Czech
    • Finnish
    • Greek
    • Hindi
    • Japanese
    • Korean
    • Persian
    • Swedish
    • Turkish
    • other →
 
Profile Documents Logout
Upload
Phylum Mollusca
Phylum Mollusca

...  Land snails use a mantle cavity  Diffusion occurs through moist skin  Oxygen is carried by circulatory system ...
Final Exam Review Help
Final Exam Review Help

... 39) Is the rate at which species produce offspring effected by ecological succession? _____NO____________________________________________________________ 40) What type of habitat is an organism that stores large quantities of water internally most likely to live in? _____ONE THAT GETS LITTLE TO NO ...
Cells Human organs/Organisation
Cells Human organs/Organisation

... Part of the stamen. It produces pollen grains. Female reproductive organ found in flowers. It is made of a stigma, style and ovary. The female sex cell in plants. Tiny plant, found inside a seed, with a very small shoot and a very small root. Joining of a male sex cell with a female sex cell. What i ...
Dissection guide - MUGAN`S BIOLOGY PAGE
Dissection guide - MUGAN`S BIOLOGY PAGE

... which empties by a short, muscular ejaculatory duct into the anus. Thus the male anus serves as an outlet for both the digestive system and the reproductive system and is often called a cloaca. Spicules secreted by and contained in spicule pouches may be extended through the anus. In copulation the ...
helminths-introduction
helminths-introduction

... of heart and then in lungs. 6.Then it breaks out the capillaries to reach alveoli. 7.Migrates upwards, crawls over epiglottis, reaches jejunum when swallowed. ...
Kingdom Animalia: Vertebrates
Kingdom Animalia: Vertebrates

... Feeding – all types  R,C,E – gills or lungs, closed circulationheart, diffusion/ kidney  Response – well-developed nervous system ...
T/F Fungi are eukaryotes
T/F Fungi are eukaryotes

... 13. Are fungi more closely related to plants or animals? 14. A digestive cavity arises in animals from the process of __________. 15. T/F Taxonomy is based on genetic relations. 16. Compare and contrast acoelomate, pseudocoelomate, coelomate. ...
BIOLOGY Specification
BIOLOGY Specification

... number of chromosomes so are genetically identical to each other and the parental cell b. recall the role of mitosis in growth of tissues by increasing cell number, repair of tissues, replacement of worn out cells and asexual reproduction. 3.2. Meiosis: a. define as nuclear and cell division that pr ...
Animal Development
Animal Development

... egg’s ER causes cortical granules to release enzymes  The enzymes in effect harden the egg’s membrane (fertilization membrane)  This hard membrane is not penetrable by any more sperm, so only 1 sperm fertilizes the egg ...
Microsoft Word 97
Microsoft Word 97

... the vertebrate groups, the haploid (n) phase is represented only by gametes (eggs and sperm). There is neither multicellular development of haploid cells nor a gametophyte stage which eventually produces gametes. For this reason, vertebrates are considered to lack alternation of generations and to r ...
Language Arts 2 column notes - SJSEighthGradePortfolio1027
Language Arts 2 column notes - SJSEighthGradePortfolio1027

... Section 4 – Genes, DNA, and Proteins Order of bases – the order of the nitrogen bases along a gene forms a genetic code that specifies what type of protein will be produced. Production of proteins – During protein synthesis, the cell uses information from a gene on a chromosome to produce a specific ...
How are living things organized?
How are living things organized?

... Unicellular vs. Multicellular Organisms • A unicellular organism must perform all functions necessary for life. • A multicellular organism has specialized cells, tissues, organs, and organ systems that perform specific functions or jobs for the organism. ...
34-3: Comparison of Invertebrates + Vertebrates
34-3: Comparison of Invertebrates + Vertebrates

... Individual cells can react to external stimuli ...
CHAPTER 2 BIOLOGICAL CLASSIFICATION The process of
CHAPTER 2 BIOLOGICAL CLASSIFICATION The process of

... They are used for medical purpose, ornamental and as soil binders and first terrestrial plants. They grow in cool, damp, shady places Possess vascular tissues (xylem and phloem) Main plant body is Sporophytes The body is differentiated into true roots, stem and leaves. Leaves may be small ...
3 The Organization of Living Things
3 The Organization of Living Things

... The function of a cell is related to its structure. Structure is the arrangement of parts in an organism. The structure of a brain cell is different from the structure of a heart muscle cell. Structure includes shape and the material a part is made of. ...
Homeostatic Mechansisms and Evolution
Homeostatic Mechansisms and Evolution

... • Cows and Cattle Egrets ...
Reynolds School District
Reynolds School District

... • Each cell in an animal body depends on the presence and functioning of other cells. • In all but the simplest animal phyla, there is specialization among cells. • A tissue is a group of similar cells, held together by cell junctions, that perform a common function. • Organs are composed of more th ...
Science – Medium Term Plan
Science – Medium Term Plan

... 1. All living things are made of cells - some organisms are made up of a single cell, others contain different cells with different purposes 2. Scientists have divided living things into five large groups called kingdoms 3. Each kingdom is divided into smaller groups to help with classification ...
sub 1.1 - the importance of having a transport system
sub 1.1 - the importance of having a transport system

... Some Multicellular Organisms The Circulatory System The Mechanism of Blood Clotting The Lymphatic System The Role of the Circulatory System in the Body’s ...
Understanding the Food Chain and Natural Selection
Understanding the Food Chain and Natural Selection

... The term “natural selection” was introduced by Charles Darwin in his 1859 book The Origin of Species. In the book, he described natural selection as the process by which species adapt to their environment. In the process, favorable heritable traits become more common in successive generations of a p ...
Category 4 Organisms and the Environment
Category 4 Organisms and the Environment

... EXPLAIN YOUR CHOICE for #2 BELOW: __________________________________________________________ __________________________________________________________ 3. How are populations affected by short-term environmental changes? A. They increase in number and diversity. B. They do not have time to adapt and ...
Middle School Science STAAR Review Cheat Sheet
Middle School Science STAAR Review Cheat Sheet

... EXPLAIN YOUR CHOICE for #2 BELOW: __________________________________________________________ __________________________________________________________ 3. How are populations affected by short-term environmental changes? A. They increase in number and diversity. B. They do not have time to adapt and ...
Prenatal Development
Prenatal Development

... one sperm enters the zona pellucida  Sperm secrete enzyme hyaluronidase to allow penetration of the zona pellucida  When one sperm enters, the zona pellucida thickens, locking out other sperm  Chromosomes from sperm and egg combine to form 23 new pairs ...
T-1 Chapter One: Biology- Study of Life
T-1 Chapter One: Biology- Study of Life

...  Light Microscope- these are like the ones we use. They shoot light at the specimen and magnify it.  Scanning Electron Microscope- shoots electrons at the surface of the specimen and scans it.  Transmission Electron Microscope- shoots electrons through a thin slice of specimen.  Other advanced c ...
Final Test Study Guide Unit 4: Adaptation Knowledge
Final Test Study Guide Unit 4: Adaptation Knowledge

... A gene is a segment of DNA that codes for a protein (not in notes) The definition of a trait (Traits, 3/21) Difference between inherited and acquired traits (Traits, 3/21) Understand how one broken gene can affect the whole body (Genes to Traits, 3/22) The differences and pros/cons of sexual and ase ...
< 1 ... 17 18 19 20 21 22 23 24 25 ... 55 >

Sex



Organisms of many species are specialized into male and female varieties, each known as a sex. Sexual reproduction involves the combining and mixing of genetic traits: specialized cells known as gametes combine to form offspring that inherit traits from each parent. Gametes can be identical in form and function (known as isogamy), but in many cases an asymmetry has evolved such that two sex-specific types of gametes (heterogametes) exist (known as anisogamy). By definition, male gametes are small, motile, and optimized to transport their genetic information over a distance, while female gametes are large, non-motile and contain the nutrients necessary for the early development of the young organism. Among humans and other mammals, males typically carry XY chromosomes, whereas females typically carry XX chromosomes, which are a part of the XY sex-determination system. Other animals have a sex-determination system as well, such as the ZW sex-determination system in birds, and the X0 sex-determination system in insects. The gametes produced by an organism are determined by its sex: males produce male gametes (spermatozoa, or sperm, in animals; pollen in plants) while females produce female gametes (ova, or egg cells); individual organisms which produce both male and female gametes are termed hermaphroditic. Frequently, physical differences are associated with the different sexes of an organism; these sexual dimorphisms can reflect the different reproductive pressures the sexes experience.
  • studyres.com © 2026
  • DMCA
  • Privacy
  • Terms
  • Report