Concepts of Biology
1st Edition
ISBN: 9781938168116
Author: Samantha Fowler, Rebecca Roush, James Wise
Publisher: OpenStax College
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Textbook Question
Chapter 18, Problem 6RQ
The process of gastrulation forms the _______.
a. blastula
b. zygote
c. organs
d. germ layers
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During embryonic development, unique cell layers develop into specific groups of tissues or organs during a stage called ________. a. the blastula stage b. the germ layer stage c. the gastrula stage d. the organogenesis stage
During the first 48-72 hours after birth, the breasts produce ________, a substance rich in protein and immunoglobulins which helps the baby adjust to a non-sterile environment.
Group of answer choices
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Chapter 18 Solutions
Concepts of Biology
Ch. 18 - Figure 18.12 Which of the following statements...Ch. 18 - Figure 18.17 Which of the following statements...Ch. 18 - In which group is parthenogenesis a normal event?...Ch. 18 - Genetically unique individuals are produced...Ch. 18 - External fertilization occurs in which type of...Ch. 18 - The process of gastrulation forms the _______. a....Ch. 18 - Which of the following gives rise to the skin...Ch. 18 - Sperm are produced in the _______. a. scrotum b....Ch. 18 - Which female organ has an endometrial lining that...Ch. 18 - Which hormone causes FSH and LH to be released? a....
Ch. 18 - Nutrient and waste requirements for the developing...Ch. 18 - Which hormone is primarily responsible for the...Ch. 18 - What might be a disadvantage to...Ch. 18 - Compared to separate sexes and assuming...Ch. 18 - What do you think would happen if multiple sperm...Ch. 18 - Compare spermatogenesis and oogenesis as to timing...Ch. 18 - Describe the events in the ovarian cycle leading...Ch. 18 - Describe the stages of labor.
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- During gastrulation, cells from the _____ layer of the bilaminar germinal disc migrate and form the three primary germ layers. a. notochord b. hypoblast c. epiblast d. mesoblastarrow_forwardBMPs are released from the ___________ blastula-stage embryo? a. dorsal b. ventral c. medial d. lateralarrow_forwardEctodermal cells of the developing embryo give rise to_____________ . a. bone tissue b. the kidneys c. the lining of the urethra d. the epidermisarrow_forward
- Opposite the micropylar end, is the__________, representing the basal partof the ovule.A. hilum B. funicle C. chalaza D. nucellusarrow_forwardSperm are produced in the ________. a. scrotum b. seminal vesicles c. seminiferous tubules d. prostate glandarrow_forwardThe outermost germ layer in a vertebrate gastrula is the____ . a. endoderm c. mesoderm b. ectoderm d. dermisarrow_forward
- 1. Embryonic development occurs during this period. A. from the ninth week of gestation to birth B. from fertilization to implantation C. from implantation to the end of the eighth week of gestation D. from conception to birth 2. Part of the gastrulation phase includes the formation of germ layers that will... A. go on to form the placenta. B. form the ectoderm, mesoderm, and endoderm that will become specific tissues and organs. C. spread disease. D. produce the amniotic fluid.arrow_forwardThe cells of the embryoblast differentiate into the ______ andthe ______.a. epiblast, hypoblastb. cytotrophoblast, syncytiotrophoblastc. amnioblast, epiblastd. epiblast, cytotrophoblastarrow_forwardWhich of the following structure develops into only the fetus? A. Blastocyte B. Zygote C. Trophoblast D. Inner cell massarrow_forward
- Layer A is called _____X________, and ______Y________ develops from this layer. Select one: a. X Y Ectoderm Nervous system b. X Y Endoderm Nervous system c. X Y Endoderm Lining of the digestive tract d. X Y Ectoderm Lining of the digestive tractarrow_forwardIn the development of amniotes (reptiles, birds, mammals), the defining feature of gastrulation is/are the __________________________. Choose all possible answers. a. Blastopore b. Blastomere c. Blastocoel d. Primitive streak e. Epiblast f. Koller’s sicklearrow_forwardWithout the motility of this structure in the female reproductive system, the ovulated egg would not make it to the fallopian tube. a. Corpus luteum b. Antrum c. Fimbrae d. Placenta e. Cervixarrow_forward
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