C. Egg - Cloudfront.net
... a. Crescent shaped gray area forms on egg opposite of sperm entry. Called the gray crescent. ● First cleavage should pass through this dividing it equally ♣ If it does and then the cells are separated, both will ...
... a. Crescent shaped gray area forms on egg opposite of sperm entry. Called the gray crescent. ● First cleavage should pass through this dividing it equally ♣ If it does and then the cells are separated, both will ...
Document
... • In nonamniotic vertebrates, basic instructions for establishing the body axes are set down early, during oogenesis or fertilization • In amniotes, local environmental differences play the major role in establishing initial differences between cells and, later, the body axes ...
... • In nonamniotic vertebrates, basic instructions for establishing the body axes are set down early, during oogenesis or fertilization • In amniotes, local environmental differences play the major role in establishing initial differences between cells and, later, the body axes ...
Lesson 6 Lesson Outline: Developmental Origins of
... the other end are mostly yolk) Oviparity and Viviparity Animals that lay eggs are oviviparous They must contain sufficient yolk to nourish the developing embryo until it is free living and can take food orally. If the egg is macrolecithal, the young may hatch essentially fully formed. If there is le ...
... the other end are mostly yolk) Oviparity and Viviparity Animals that lay eggs are oviviparous They must contain sufficient yolk to nourish the developing embryo until it is free living and can take food orally. If the egg is macrolecithal, the young may hatch essentially fully formed. If there is le ...
Lesson 5 - Zoology, UBC
... the other end are mostly yolk) Oviparity and Viviparity Animals that lay eggs are oviviparous They must contain sufficient yolk to nourish the developing embryo until it is free living and can take food orally. If the egg is macrolecithal, the young may hatch essentially fully formed. If there is le ...
... the other end are mostly yolk) Oviparity and Viviparity Animals that lay eggs are oviviparous They must contain sufficient yolk to nourish the developing embryo until it is free living and can take food orally. If the egg is macrolecithal, the young may hatch essentially fully formed. If there is le ...
LabStarfishDevelopment
... The outer layer of the gastrula is called the ectoderm (ecto=outside), and develops into the skin and nervous system of the animal. The inner layer of this form is called the endoderm (endo=inside or within), and develops into the lining of the digestive tract and organs that are part of the digesti ...
... The outer layer of the gastrula is called the ectoderm (ecto=outside), and develops into the skin and nervous system of the animal. The inner layer of this form is called the endoderm (endo=inside or within), and develops into the lining of the digestive tract and organs that are part of the digesti ...
Lecture Outline
... cells influence their fate, usually by causing changes in gene expression. This mechanism, induction, brings about the differentiation of many specialized cell types. ○ Induction may be mediated by diffusible chemical signals or by cell-surface interactions between cells in contact. ...
... cells influence their fate, usually by causing changes in gene expression. This mechanism, induction, brings about the differentiation of many specialized cell types. ○ Induction may be mediated by diffusible chemical signals or by cell-surface interactions between cells in contact. ...
anidevlt - CowanScience
... different environments depending on their location in the embryo The different environments cause different genes to be expressed in different cells This helps guide and control the process of development ...
... different environments depending on their location in the embryo The different environments cause different genes to be expressed in different cells This helps guide and control the process of development ...
Lecture 15 Dev Bio JS
... However Spemann’s work together with the work of others has shown that this interaction of the chordamesoderm and the ectoderm is not sufficient to organize the entire embryo. Rather it initiates a series of sequential inductive events. This key induction in which the progeny of the dorsal lip induc ...
... However Spemann’s work together with the work of others has shown that this interaction of the chordamesoderm and the ectoderm is not sufficient to organize the entire embryo. Rather it initiates a series of sequential inductive events. This key induction in which the progeny of the dorsal lip induc ...
You and Your Genes Revision Lesson 1
... • Cells can also be taken from young fetuses and tested. If the test is positive, parents may terminate the pregnancy. ...
... • Cells can also be taken from young fetuses and tested. If the test is positive, parents may terminate the pregnancy. ...
Trends in Biotechnology
... Gurdon generated new frogs by transferring tadpole intestine cell nuclei into enucleated eggs from the African clawed toad, Xenopuslaevis. ...
... Gurdon generated new frogs by transferring tadpole intestine cell nuclei into enucleated eggs from the African clawed toad, Xenopuslaevis. ...
Reproduction & Development
... • All of the cells in an animal’s body, with the exception of a few specialized ones that have lost their nuclei, contain the same compliment of genetic information • To a large degree, a cell’s location in the developing embryo determines its fate (but this is only true up until a certain stage in ...
... • All of the cells in an animal’s body, with the exception of a few specialized ones that have lost their nuclei, contain the same compliment of genetic information • To a large degree, a cell’s location in the developing embryo determines its fate (but this is only true up until a certain stage in ...
biology ch. 18 notes “the evolution of invertebrate diversity”
... *obtain nutrients by ingestion (*includes some exceptions) ✍ lack cell walls ✍ collagen extracellular structural protein unique to animals ✍ *muscle for movement ✍ nerves ...
... *obtain nutrients by ingestion (*includes some exceptions) ✍ lack cell walls ✍ collagen extracellular structural protein unique to animals ✍ *muscle for movement ✍ nerves ...
Developmental Systems Theory
... Problems with the Molecular Gene Concept • Challenge—avoid cutting too finely so that each nucleotide becomes a gene • But the molecular details of the gene often don’t matter in terms of effects, since alternatives do just as well – “If we require that gene replication be robustly explained by its ...
... Problems with the Molecular Gene Concept • Challenge—avoid cutting too finely so that each nucleotide becomes a gene • But the molecular details of the gene often don’t matter in terms of effects, since alternatives do just as well – “If we require that gene replication be robustly explained by its ...
Stephanie Bobbitt - jeffyoshimura.com
... endoderm; 4 extraembryonic membranes formed – chorion, amnion, yolk sac (for mammals site of early formation of blood cells), and allantois (incorporated into umbilical cord) The Cellular and Molecular Basis of Morphogenesis and Differentiation in Animals o Morphogenesis in animals involves specific ...
... endoderm; 4 extraembryonic membranes formed – chorion, amnion, yolk sac (for mammals site of early formation of blood cells), and allantois (incorporated into umbilical cord) The Cellular and Molecular Basis of Morphogenesis and Differentiation in Animals o Morphogenesis in animals involves specific ...
Saladin, Human Anatomy 3e
... into an embryonic disc, with two cell layers called epiblast and hypoblast. The embryonic disc soon elongates and forms a median primitive streak in the epiblast. 9. In gastrulation, epiblast cells migrate into the primitive streak and replace the hypoblast, then form a middle layer of cells called ...
... into an embryonic disc, with two cell layers called epiblast and hypoblast. The embryonic disc soon elongates and forms a median primitive streak in the epiblast. 9. In gastrulation, epiblast cells migrate into the primitive streak and replace the hypoblast, then form a middle layer of cells called ...
Viviparity
... Blastoderm cells on one side of the egg begin to enlarge and multiply. This region, known as the germ band (or ventral plate), is where the embryo's body will develop. The rest of the cells in the blastoderm become part of a membrane (the serosa) that forms the yolk sac. Cells from the serosa grow a ...
... Blastoderm cells on one side of the egg begin to enlarge and multiply. This region, known as the germ band (or ventral plate), is where the embryo's body will develop. The rest of the cells in the blastoderm become part of a membrane (the serosa) that forms the yolk sac. Cells from the serosa grow a ...
Ch 47 Animal Development Abbreviated
... determined by the zygote’s genome • and molecules in the egg called cytoplasmic determinants ...
... determined by the zygote’s genome • and molecules in the egg called cytoplasmic determinants ...
PowerPoint Presentation to accompany Life: The Science of
... eyes of fruit flies and the camera-like eyes of house mice. • The genes involved in eye development in these two species are so similar that the fruit fly cell that normally develops into part of a leg will form an eye when a mouse Pax6 gene is expressed in it. ...
... eyes of fruit flies and the camera-like eyes of house mice. • The genes involved in eye development in these two species are so similar that the fruit fly cell that normally develops into part of a leg will form an eye when a mouse Pax6 gene is expressed in it. ...
The Processes of Development
... The 13 seemingly identical segments of the Drosophila larva correspond to the specialized adult segments. The process of differentiation begins with establishing the polarity of the embryo. • In Drosophila, unequal distribution of morphogens helps establish the basic coordinates. • The morphogen ...
... The 13 seemingly identical segments of the Drosophila larva correspond to the specialized adult segments. The process of differentiation begins with establishing the polarity of the embryo. • In Drosophila, unequal distribution of morphogens helps establish the basic coordinates. • The morphogen ...
AP Embryology 2014 v2
... • At early stages of development, all vertebrate embryos are very similar • Major stages of embryonic development are: fertilization, cleavage, gastrulation, organogenesis • The zygote undergoes a series of mitotic divisions known as cleavage which produces a blastula (often takes the form of a mult ...
... • At early stages of development, all vertebrate embryos are very similar • Major stages of embryonic development are: fertilization, cleavage, gastrulation, organogenesis • The zygote undergoes a series of mitotic divisions known as cleavage which produces a blastula (often takes the form of a mult ...
10b Repro Sys III- Pregn Developmt
... after ovulation Sperm are viable for 12 to 48 hours after ejaculation Sperm cells must make their way to the uterine tube for fertilization to be possible ...
... after ovulation Sperm are viable for 12 to 48 hours after ejaculation Sperm cells must make their way to the uterine tube for fertilization to be possible ...
PMS: pre Menstrual syndrome
... • Serve as primitive tissues from which all body organs will derive ...
... • Serve as primitive tissues from which all body organs will derive ...
Frog Mesoderm
... Red Cell Lineage • Other cells more committed – place bone marrow cells in culture with high or low erythropoietin – Low: small colonies (ca. 60 cells ca 5 div) – High: large colonies (ca. 11-12 divisions) – so CFU -> BFU-E (determined) -6-7 div-> – CFU-E (detm) -5div-> erythrocytes ...
... Red Cell Lineage • Other cells more committed – place bone marrow cells in culture with high or low erythropoietin – Low: small colonies (ca. 60 cells ca 5 div) – High: large colonies (ca. 11-12 divisions) – so CFU -> BFU-E (determined) -6-7 div-> – CFU-E (detm) -5div-> erythrocytes ...
Embryonic Development
... 5. Gastrulation – formation of the trilaminar disk (3 primary germ layers) from the bilaminar disk (hypoblast and epiblast) i. Endoderm ii. Mesoderm iii. Ectoderm B. Embryo – 0 to 8 weeks C. Fetus – 9 weeks to birth D. Implantation 1. Fetal portion – chorion that develops from the trophoblast i. Cel ...
... 5. Gastrulation – formation of the trilaminar disk (3 primary germ layers) from the bilaminar disk (hypoblast and epiblast) i. Endoderm ii. Mesoderm iii. Ectoderm B. Embryo – 0 to 8 weeks C. Fetus – 9 weeks to birth D. Implantation 1. Fetal portion – chorion that develops from the trophoblast i. Cel ...
1. dia - Semmelweis University
... - the cells start to compact and flatten - BUT the zona pellucida does not enlarge -2 cell types will differentiate: - embryoblast (inner) - trophoblast (outer) ...
... - the cells start to compact and flatten - BUT the zona pellucida does not enlarge -2 cell types will differentiate: - embryoblast (inner) - trophoblast (outer) ...
Drosophila embryogenesis
Drosophila embryogenesis, the process by which Drosophila (fruit fly) embryos form, is a favorite model system for geneticists and developmental biologists studying embryogenesis. The small size, short generation time, and large brood size make it ideal for genetic studies. Transparent embryos facilitate developmental studies. Drosophila melanogaster was introduced into the field of genetic experiments by Thomas Hunt Morgan in 1909.