Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Textbook Question
Chapter 27, Problem 5RQ
During embryonic development, unique cell layers develop into specific groups of tissues or organs during a stage called _____________.
- the blastula stage
- the germ layer stage
- the gastrula stage
- the organogenesis stage
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Sexual differentiation begins close to 4 weeks after fertilization, but cannot be seen visually until about 6 weeks post fertilization. All fetuses begin with a ______________________ gonad that is able to become either ovaries or testes, depending on the presence or absence of the Y chromosome.
If the Y chromosome is present, a region of the Y chromosome will begin expressing genes that start the process of masculinization of internal structures. This region is known as the ______________________________ region or ___________ for short. The expression of these genes causes the bipotential gonad to develop into the testes. Once the testes have started developing, two hormones, testosterone and Anti-MüllerianHormone are produced. Testosterone causes the _____________________ ducts to develop into the _____________________. Testosterone also causes the internal development of the __________________ and __________________. Anti-Müllerian Hormone causes the ______________________ ducts…
When an embryo is clearly recognizable as a human being it is called a(an) ______________.
The period of development during which the contents of a zygote is divided into smaller and smaller cells is ___________.
Chapter 27 Solutions
Biology 2e
Ch. 27 - Figure 27.5 If a Hox 13 gene in a mouse was...Ch. 27 - Figure 27.6 Which of the following statements is...Ch. 27 - Figure 27.9 Which of the following statements...Ch. 27 - Which of the following is not a feature common to...Ch. 27 - During embryonic development, unique cell layers...Ch. 27 - Which of the following phenotypes would most...Ch. 27 - Which of the following organisms is most likely to...Ch. 27 - Which of the following is not possible? radially...Ch. 27 - An animal whose development is marked by radial...Ch. 27 - Consulting the modern phylogenetic tree of...
Ch. 27 - Which of the following is thought to be the most...Ch. 27 - As with the emergence of the Acoelomorpha phylum,...Ch. 27 - Which of the following periods is the earliest...Ch. 27 - What type of data is primarily used to determine...Ch. 27 - The time between 542-488 million years ago marks...Ch. 27 - Until recent discoveries suggested otherwise,...Ch. 27 - Plant life first appeared on land during which of...Ch. 27 - Approximately how many mass extinction events...Ch. 27 - Why might the evolution of specialized tissues be...Ch. 27 - Describe and give examples of how humans display...Ch. 27 - How have Hox genes contributed to the diversity of...Ch. 27 - Using the following terms, explain what...Ch. 27 - Explain some of the advantages brought about...Ch. 27 - Describe at least two major changes to the animal...Ch. 27 - How is it that morphological data alone might lead...Ch. 27 - Briefly describe at least two theories that...Ch. 27 - How is it that most if not all, of the extant...
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- Proteins (including transcription factors) and mRNAs that come in with the egg of an embryo will start the process of determination in a growing embryo. These are collectively called ___________ ____________arrow_forwardFill in the blank: The meiosis of egg formation is called _______________________.arrow_forward__________ is the process by which egg cells are formed.arrow_forward
- As each primary oocyte completes meiosis I, the two cells that form are a secondary oocyte and a ________________arrow_forwardChemicals that pass through the placenta’s screen and mayharm an embryo or fetus are called _____________.arrow_forwardIn a female human, the oogonium forms when the female is a _____________.arrow_forward
- ________________________is the period of development from fertilization to birth, whereas is the period of development from birth to death.arrow_forwardA chromosome has two sides, which are identical copies of the same DNA molecule due to ___________, which happens before the cell divides to make the gamete/sex cell.arrow_forwardFill in the blank: The cell resulting from fertilization is called a(an) ___________________.arrow_forward
- Give the correct answer to the question. There can be multiple correct answers.If none of the choices are correct, then write the correct answer. I. The germ band needs to retract for fruit fly segments to develop properly.II. The formation of the sea urchin archenteron is made possible by epithelial cells that underwent an epithelial-to-mesenchymal transition.III. Frog gastrulation involves the epiboly of endoderm cells.IV. Chicken endoderm and mesoderm is formed through the migration of cells through both the anterior and posterior end of the primitive streak. a. All choices are true b. I & II are true but IV is falsec. III is false d. IV is sometimes truearrow_forwardDuring fertilization in flowering plants, one sperm cell nucleus fuses with the egg nucleus, producing the diploid zygote. The other sperm nucleus fuses with the ___________________________________, producing the triploid ________________________, which develops as temporary tissue that nourishes the embryo. This process is called ___________________ fertilization. What tissue nourishes the embryo in gymnosperm seeds?arrow_forwardOn average, girls begin puberty at about the ageof______________ , boys at about the age of ____________.arrow_forward
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