Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 43.5, Problem 3R
Summary Introduction
To review:
The embryo of the first trimester is sensitive to environmental risks.
Introduction:
In mammals, pregnancy occurs when the fertilized egg (zygote) gets implanted in the endometrium of the mother’s uterus. The period of bearing the developing embryo or fetus inside the womb till its birth is referred to as gestation. In humans, the gestation period is categorized into three trimesters, each having a period of three months.
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Life: The Science of Biology
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- How do the amount and distribution of cytoplasm in the fertilized egg influence early development?arrow_forwardwhat causes a deletion to occur during early fetal development.? is it an alteration?arrow_forwardWhat parts are persistent throughout the development of the embryo? Why are these present in all the stages?arrow_forward
- How does the embryo get nourishment inside the mother’s body?arrow_forwardWhy is it concerning for a fertilized egg to implant outside of the uterus?arrow_forwardWhich of the following is required for successful fetal development after the egg has been fertilized? a) That the corpus luteum remains throughout the pregnancy b) Production of estrogen (estradiol) and progesterone from the placenta c) Release of hCG (human chorionic gonatotropin) from the placentaarrow_forward
- Which of the following is (are) true in regard to the fetal stage of development?arrow_forwardHow do the somites, intermediate mesoderm, and lateral plate mesoderm contribute to embryonic development?arrow_forwardWhat generates the first differences among cells in an early embryo? And what controls the differentiation of all the various cell types as development proceeds?arrow_forward
- Are different stages of development tend to generate differences in stimulating cleavage and coalitions?arrow_forwardAfter fertilization a developing embryos goes through several changes. At about 2-3 days, what is the embryo referred to as?arrow_forwardA: Why do sea urchins have external fertilization? [Discuss the life style of the developing sea urchin embryo in the water column compared to a very different ecological niche of the adults on the ocean floor. Besides, would you want to give live birth to a sea urchin! ouch!] 2: Then why don't the parents take care of the young? [In fact the adults do in a way. After the embryo has grown large enough and metamorphosed into a young urchin they hide in the spines of the adults, living off of the scraps of food produced from the messy eating of the adults] 3: Because the urchin life involves two or more ecological niches, they are more susceptible to predation and exposure to environmental toxins. What environmental conditions, predators and toxins might they be exposed to at each stage?arrow_forward
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