BIOLOGY
12th Edition
ISBN: 9781260169614
Author: Raven
Publisher: RENT MCG
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Chapter 21, Problem 7U
The possession of fine fur in 5-month human embryos indicates
a. that the womb is cold at that point in pregnancy.
b. humans evolved from a hairy ancestor.
c. hair is a defining feature of mammals.
d. some parts of the embryo grow faster than others.
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Students have asked these similar questions
The following diagram is of the blastopore stage of embryonic development. Based on the information in the diagram, which of the following statements is correct
a. Most animals exhibit this pattern of development.
b. It would have formed by spiralian cleavage.
c. It would exhibit determinate development.
d. All of the choices are correct.
Using the following list, describe the proper sequence for the events of animal development:
1. Tissues, organs, and other body structures in each segment are formed.
2. Axes of the entire animal are determined.
3. Cells become differentiated.
4. The entire animal is divided into segments.
a. 2, 3, 4, 1
b. 1, 2, 4, 3
c. 2, 4, 3, 1
d. 3, 2, 4, 1
e. 2, 4, 1, 3
Which of the following is the correct order for the four developmental phases in animals?
A. Segmentation of the body
B. Determination
C. Cell differentiation
D. Formation of body axes
a. A, B, C, D
b. A, D, C, B
c. D, A, B, C
d. D, A, C, B
Chapter 21 Solutions
BIOLOGY
Ch. 21.1 - Prob. 1LOCh. 21.1 - Prob. 2LOCh. 21.2 - Prob. 1LOCh. 21.2 - Distinguish between demonstrating that evolution...Ch. 21.3 - Contrast the processes of artificial and natural...Ch. 21.3 - Prob. 2LOCh. 21.4 - Prob. 1LOCh. 21.4 - Prob. 2LOCh. 21.4 - Prob. 3LOCh. 21.5 - Explain the evolutionary significance of...
Ch. 21.5 - Prob. 2LOCh. 21.6 - Prob. 1LOCh. 21.6 - Prob. 2LOCh. 21.7 - Characterize the criticisms of evolutionary theory...Ch. 21.7 - Prob. 2LOCh. 21 - Suppose that a male with a beak depth of 10 mm...Ch. 21 - Prob. 1IQCh. 21 - Prob. 2IQCh. 21 - Prob. 3IQCh. 21 - Why might the evolutionary line leading to...Ch. 21 - Artificial selection is different from natural...Ch. 21 - Gaps in the fossil record a. demonstrate our...Ch. 21 - The evolution of modern horses (Equus) is best...Ch. 21 - Homologous structures a. are structures in two or...Ch. 21 - Convergent evolution a. is an example of...Ch. 21 - Prob. 6UCh. 21 - The possession of fine fur in 5-month human...Ch. 21 - In Darwins finches, a. occurrence of wet and dry...Ch. 21 - Prob. 2ACh. 21 - Convergent evolution is often seen among species...Ch. 21 - What conditions are necessary for evolution by...Ch. 21 - Explain how data shown in figure 21.2a and b...Ch. 21 - Prob. 3SCh. 21 - Refer to figure 21.5, artificial selection in the...Ch. 21 - The ancestor of horses was a small, many-toed...
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- Which statement is true of hox genes? Group of answer choices A. they regulate development of body regions and are found in all animals B. they control the functioning of cells and are found in all life C. they control growth and development in plants D. they are only found in insects and control segmentationarrow_forwardGene duplications during vertebrate evolution have led toA. the control of body segmentation in mice by four copies of Hox genes.B. the abundance of somites in vertebrate embryos.C. the loss of other genes.D. a long development period of feathers in the chicken embryo.E. All of the abovearrow_forwardAccording to the video “The Biology of Skin Color”, how does folate deficiency affect fetal development? A. It can cause birth defects B. It helps the fetus to develop faster C. It does not affect fetal development D. It increases the health of the fetusarrow_forward
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