Aquaculture Science
3rd Edition
ISBN: 9781133558347
Author: Parker
Publisher: Cengage
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After the eighth week of development an embryos is referred to as what?
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Define and describe the main features of the following developmental stages: fertilization, cleavage, gastrulation.
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During cleavage, the _______ is converted to a ball of cells, which in turn is transformed into the __________. a. zygote; blastocyst b. trophoblast; embryonic disk c. ovum; embryonic disk d. blastocyst; embryonic disk
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___________ removes webs between developing digits. a. Gastrulation c. Apoptosis b. Lactation d. Implantation
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_________ is the gene-guided process by which cells in different locations in the embryo become specialized. a. Implantation b. Neurulation c. Cell differentiation d. Morphogenesis
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During the fetal period, ____________. a. gastrulation ends b. somites form c. a tail forms d. limb movements begin
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Label the early development stages shown in the following diagram.
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The placenta is formed from ________. the embryos mesenchymal cells the mothers endometrium only the mothers endometrium and the embryos chorionic membrane the mothers endometrium and the embryos umbilical cord
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A Survey of Human Development from Fertilization to Birth 4. The gestation of a fetus occurs over 9 months and is divided into three trimesters. Describe the major events that occur in each trimester. Is there a point at which the fetus becomes more human?
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Match each developmental stage with its description.
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Give the origins and functions of the chorion, amnion, allantois, and yolk sac.
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_____ production is continuous from puberty onward in males; _____ production is cyclic and intermittent in females. a. Egg; sperm b. Sperm; egg c. Testosterone; sperm d. Estrogen; egg
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What are the roles of the chorion and amnion in terrestrial vertebrate embryos?
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