Biology: Science for Life with Physiology (5th Edition)
5th Edition
ISBN: 9780321922212
Author: Colleen Belk, Virginia Borden Maier
Publisher: PEARSON
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Chapter 22, Problem 2CTS
Summary Introduction
To describe:
The point of development where the developing organism becomes human.
Introduction:
The human development is divided mainly into three phases germinal, embryonic and fetal. The germinal development is referred to the pre zygotic phase, after the formation of zygote up to 10th week it is referred as embryo and from 11th week to parturition, it is referred as fetal.
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The development of a zygote into a baby involves pre-embryonic development for the first 2 weeks, followed by embryonic development for the next 6 weeks, and finally fetal development until the baby is born. When is the developing baby considered a fetus?
Select one:
a. When all major organ systems have formed
b. After the neural tube forms
c. Once gastrulation is complete
d. When most major organ systems have formed; the neural system forms during the fetal stage
From what you know about embryonic development, do you think that a cell from the inner cell mass or one from the ectoderm has more developmental potential?
People could observe the development of an embryo before they had the tools to see cells and parts of cells such as DNA. How do you think they explained the development from embryo to organism?
Please answer the questions in 1-5 sentences only
Chapter 22 Solutions
Biology: Science for Life with Physiology (5th Edition)
Ch. 22 - Prob. 1LTBCh. 22 - Describe the male and female reproductive...Ch. 22 - Describe gametogenesis in males and females.Ch. 22 - A sperm cell follows which path? seminiferous...Ch. 22 - An egg cell that is not fertilized follows which...Ch. 22 - Which of the following is mismatched? urethra:...Ch. 22 - Gametogenesis _________ . A. begins at puberty in...Ch. 22 - Prob. 8LTBCh. 22 - Prob. 9LTBCh. 22 - Prob. 10LTB
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- The development of sex and gender is a good example of a developmental cascade because: Group of answer choices Although having an X and a Y chromosome at conception typically leads to the development of testes during prenatal development, this may not lead to typical male genitalia if certain hormones are present later in development Two people may have the same gonads early in prenatal development but end up with different external genitalia and gender identities as a result of differences in the prenatal environment All of the options listed here are correct Having two X chromosomes at conception typically leads to the development of ovaries during prenatal development, which typically leads to high levels of estrogen in puberty, which typically leads to a female gender identity in adulthoodarrow_forwardIn-vitro fertilization occurs in the laboratory. The resulting embryos remain in a laboratory culture for up to six days before being transferred to the potential mother. If fertilization had occurred naturally (i.e., inside the female reproductive system instead of in-vitro), where would the embryo be and what developmental processes would it be undergoing during those first six days of development?arrow_forwardDuring the organogenesis stage, several of the five essential developmental processes take place. Choose two of these essential processes and describe how and when they occur during the organogenesis stage. Be specific about the cells, tissues, and organs involved and the results.arrow_forward
- Which of the following correctly identifies the different phases of human development? Select one: A. The 1st trimester is fertilization and mitosis, and 2nd and 3rd trimesters involve differentiation. B. Week 1 to 8 are called fetal development, and weeks 9 to 39 are called embryonic development. C. The 1st trimester is called embryonic development, the 2nd trimester is called fetal development, and the 3rd trimester is when the baby grows to gain more weight. D. Week 1 to 8 are called embryonic development, and weeks 9 to 39 are called fetal development.arrow_forwardMatch each developmental stage with its description.arrow_forwardHuman development begins when cells are exposed to: Question 12 options: NODAL embryokinesarrow_forward
- Which of the following statements clearly describes the difference between embryonic and fetal development? Select one: a. Embryonic development begins during the tenth week of gestation, a time of morphogenesis. b. Organs continue to grow and develop during embryonic development. c. Fetal development begins during the ninth month of gestation, a time of rapid growth. d. Organs continue to grow and develop during fetal development.arrow_forwardIdentify and describe the stages of human embryonic developmentarrow_forwardIt is the result of the union of human egg and sperm cell which initiates prenatal development. > embryo > zygote > morula > fetus > all of the abovearrow_forward
- What is organogenesis, and why is this concept important to the process of development?arrow_forwardWhat is meant by the term “activation” in embryology?arrow_forwardFor every developmental stage, there is an expected developmental task, what happens when the expected developmental tasks are not achieved at the corresponding developmental stage?arrow_forward
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