BIOLOGY
BIOLOGY
12th Edition
ISBN: 9781260169614
Author: Raven
Publisher: RENT MCG
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Chapter 19, Problem 4A
Summary Introduction

Introduction:

Pattern formation is the determination of relative location of the cells in an organism’s body. It happens even before the cells become determined and differentiated.

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The expression of homeotic genes leads to a. the establishment of body axes. b. the formation of segments in the embryo. c. the determination of structures within segments. d. cell differentiation.
Which of the following statements is incorrect?a. The placenta secretes hormones such as progesterone, hCG, and estrogen.b. Embryonic tissue and maternal tissue forms the placenta.c. The chorion supplies nutrients to the embryo by diffusion.d. The umbilical cord is formed by one artery and two veins
Which of the following statements is NOT correct about the umbilical cord? Select one: a. The umbilical cord is formed from the chorion. b. The placenta connects to the embryon via the umbilical cord. c. The umbilical cord consists of two arteries and one vein. d. The umbilical cord is formed from the yolk sac and the allantois.
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Embryology | Fertilization, Cleavage, Blastulation; Author: Ninja Nerd;https://www.youtube.com/watch?v=8-KF0rnhKTU;License: Standard YouTube License, CC-BY