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Chapter 48: Problem 1

Major contributors to the axes of the animal body are the: a. sperm and egg cytoplasm. b. sperm and egg chromosomes. c. ribosomes and mitochondria d. egg nucleus and yolk. e. pigments.

Short Answer

Expert verified
The major contributors to the axes of the animal body are the 'sperm and egg cytoplasm'.

Step by step solution

01

Understand the process of axis formation

Research about the process of axis formation which occurs very early in the development of an animal embryo. These initial stages are critical in establishing an organized structure of the animal body.
02

Evaluate the role of each option in axis formation

Consider the role of sperm and egg cytoplasm, sperm and egg chromosomes, ribosomes and mitochondria, egg nucleus and yolk, and pigments in the process. Evaluate how each option may contribute to the formation of the axes of the animal body.
03

Make the selection

Based on your understanding of the process of formation of axes in the animal body and evaluation of the roles of each option, make the selection. In this case, the major contributors to the axes of the animal body are 'sperm and egg cytoplasm', because it's during the fertilization and merging of sperm and egg, and the resulting movement and distribution of the cytoplasm, that the early development of anterior-posterior and dorsal-ventral axes are determined.

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Most popular questions from this chapter

A major event during gastrulation is: a. the outward movement of cells at the dorsal lip of the blastopore. b. the displacement of the archenteron by the blastocoel. c. the formation of the coelom from the endoderm. d. the extension of ectoderm and endoderm to form the yolk sac. e. the development of ectoderm to form epidermal and neural tissues.

To contribute to the formation of a nervous system: a.the neural crest develops into motor neurons. b. the neural tube is converted into a neural plate. c. the notochord induces the overlying ectoderm to become a neural plate. d. the roof of the archenteron induces the formation of the neural tube. e. somites give rise to the autonomic nervous system.

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During embryonic development in many humans, the cells of the lower earlobe die resulting in an unattached earlobe. For this to occur one would deduce that: a. \(\quad C E D-3\) genes are inhibited. b. \(\quad C E D-4\) genes are inhibited. c. caspase-9 is deactivated. d. \(\quad C E D-9\) is actively expressed. e. the proteins encoded by \(B c l\) genes are inactivated.

Which of the following mechanisms does not contribute to zygote development? a. meiosis b. mitosis c. selective cell adhesions d. determination e. induction
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