EBK BIOLOGY
5th Edition
ISBN: 9780100667976
Author: Maier
Publisher: YUZU
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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?
State and explain 5 effects of tobacco smoking by a pregnant mother on the foetus development. (400 words)
Identify and explain 5 disadvantages of In vitro fertilisation (IVF) as an intervention to have a baby. (400 words)
Why is breast feeding in the first 3month of a baby very important? (200 words)
Higher animals undergo sexual reproduction despite its complexity, why. Give 5 reasons. (400 words)
Describe five changes that occur in a flower after fertilisation. (200 words)
Chapter 22 Solutions
EBK BIOLOGY
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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- Do all of them please True/False: 24) Studies of invertebrate and vertebrate development suggest that there is a universal body plan for bilateral animal development.Answer: 25) One of the four overlapping stages in animal development is apoptosisAnswer: 26) The primary interest of genetic research into stem cells is the desire to be able to clone a human being.Answer: 27) Unipotent cells may differentiate into all other cell types of the body.Answer: 28) The reduction of pollutants in the environment by microorganisms is called biodegradation.Answer: 29) A transgenic organism has recombinant DNA integrated into its genome.Answer: 30) An organism that can be regenerated by somatic cells is called multipotent.Answer:arrow_forwardWhen doctors discuss prenatal development, they often calculate the due date from the first day of menstruation. In fact, the baby’s gestational age is calculated from the first day of menstruation. At a maternity clinic, an obstetrician mentions that when a woman is 10 weeks pregnant, the baby is referred to as a fetus. Which of the following is the correct calculation of the baby’s age from the moment of fertilization, assuming a 28-day ovarian cycle? Select one: a. The baby is 8 weeks old. This is when organ formation has completed. b. The baby is 12 weeks old and at the end of the first trimester. c. The baby is in its second trimester. This is when they are referred to as a fetus. d. The baby is 10 weeks old as stated by the doctor.arrow_forwardWhen doctors discuss prenatal development, they often calculate the due date from the first day of menstruation. In fact, the baby’s gestational age is calculated from the first day of menstruation. At a maternity clinic, an obstetrician mentions that when a woman is 10 weeks pregnant, the baby is referred to as a fetus. Which of the following is the correct calculation of the baby’s age from the moment of fertilization, assuming a 28-day ovarian cycle? a. The baby is 8 weeks old. This is when organ formation has completed. b. The baby is 10 weeks old as stated by the doctor.arrow_forward
- 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 onlyarrow_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_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_forward
- 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_forwardMatch each developmental stage with its description.arrow_forwardWhich 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_forward
- It is the result of the union of human egg and sperm cell which initiates prenatal development. > embryo > zygote > morula > fetus > all of the abovearrow_forwardWhat is organogenesis, and why is this concept important to the process of development?arrow_forwardIdentify and describe the stages of human embryonic developmentarrow_forward
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