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need help with an essay question: Distinguish a body cavity (i.e., coelom) from an alimentary canal in terms of embryonic tissues of origin and relative position in the adult animal

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Tod Thiel
Tod ThielLv2
28 Sep 2019

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Related questions

Chapter 9 Study Guide

Recognize and identify the 5 major grades of organization

Be able to know what a metazoan is

Know what parenchyma and the stroma are

Know the four ways in which animal body plans are different

Know the types of animal symmetry

Know the names of the embryonic germ layers, where they are located and what a diploblastic and triploblastic animal consists of

Be able to identify and/or label the regions of bilaterally symmetrical animals

Know the 3 planes of dividing a bilaterally symmetrical animal

Define cephalization and know its purpose

Identify the acoelomate, pseudocoelomate, and eu/coelomate body plans

Know the 2 ways in which coelomate body plans are formed

Differentiate between a protostome and deuterostome

Identify the 4 classes of tissues found in animal bodies

Know the term that means the study of tissues

Understand the major differences among the tissues and their location within an animal body

An organism that is cephalized is probably ___________________.

bilaterally symmetrical

is segmented

is diploblastic

has a coelom

1 points

QUESTION 33

Cotton-topped tamarins are small primates with tufts of long white hair on their heads. While studying these creatures, you notice that males with longer hair get more opportunities to mate and father more offspring. To test the hypothesis that having longer hair is adaptive in these males, you should _____.

test whether other traits in these males are also adaptive

look for evidence of hair in ancestors of tamarins

determine if hair length is heritable

test whether males with shaved heads are still able to mate

1 points

QUESTION 34

Which of these is not an animal?

ctenophore

poiferan

choanoflagellate

cnidaria

1 points

QUESTION 35

What would be the best anatomical feature to look for to distinguish a gastropod from a chiton?

presence of muscular foot

presence of a radula

production of eggs

number of shell plates

1 points

QUESTION 36

If radial cleavae occurs during development, the animal will be a protostome.

True

False

1 points

QUESTION 37

The "heart" of arthopods is located ______________.

ventrally

centrally

dorsally

sagitally

1 points

QUESTION 38

Which structure do bivalves use for feeding?

radula

ctenidia (gills)

beak

foot

1 points

QUESTION 39

Claytonia virginica is a woodland spring herb with flowers that vary from white to pale pink to bright pink. Slugs prefer to eat pink-flowering over white-flowering plants (due to chemical differences between the two), and plants experiencing severe herbivory are more likely to die. The bees that pollinate this plant also prefer pink to white flowers, so that Claytonia
with pink flowers have greater relative fruit set than Claytonia with white flowers. A researcher observes that the percentage of different flower colors remains stable in the study population from year to year. Given no other information, if the researcher removes all slugs from the study population, what do you expect to happen to the distribution of flower colors in the population over time? 22.2

The percentage of pink flowers should increase over time.

The percentage of white flowers should increase over time.

The distribution of flower colors should not change.

The distribution of flower colors should randomly fluctuate over time.

1 points

QUESTION 40

The water vascular system of echinoderms _____________.

functions as a circulatory system that distributes nutrients to body cells

function in locomotion and feeding

is bilateral in organization, even though the adult animal is not blaterally symmetrical

is analogous to the gastrovascular cavity of flatworms

1 points

QUESTION 41

In Phylum Mollusca, the fluid of the open circulatory system is called hemolymph.

True

False

1 points

QUESTION 42

You find what you believe is a new species of animal. Which of the following characteristics would enable you to argue that it is more closely related to a flatworm than it is to a roundworm?

It is a suspension feeder.


It is a suspension feeder.

It has no coelom.

It is shaped like a worm.

It has a mouth and an anus.

1 points

QUESTION 43

You observe that a mystery organism in a pond never comes up to the pond's surface. If you are able to catch one of these organisms, bring it to the lab and dissect it, you should find ______________.

gills

spiracle

trachea

book lungs

1 points

1. Discuss von Baer’s laws using examples of how early embryologists contributed to a phylogenetic approach to evolution. Give two specific examples of organisms and discuss whether the developmental biologists were correct or not.

2. Explain the origin of the word “syndrome” and in that context discuss why a mutation in gene could lead to abnormalities in seemingly unrelated tissues in the later embryonic and adult stages. Be sure to discuss a specific gene and gene mutation.

3. Compare and contrast (similarities and differences) between allometry and isometry. Define these terms and give two examples stating the similarities and differences in each.

4. Give an example of a soluble diffusible substance that is released by cells and diffuses to affect other cells to make developmental changes. Name the substance, name the organism and discuss in complete detail the developmental event it regulates.

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