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Speculate as to why Ctenophores such as comb jellies, andCnidarians such as jellyfish, corals and sea anemones generally donot have the same degree of cephalization as arthropods andchordates.

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Beverley Smith
Beverley SmithLv2
29 Sep 2019

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Related questions

trouble with genetics problem that has several genes, I cant seem to set it up right.

In clown fish there is a gene that controls their preference for red or yellow sea anemones. Interestingly, the preference for red sea anemones is dominant in males but recessive in females. a third allele exists that gives the fish a preference green anemones that is recessive to all other known alleles in either sex.

The gene that controls the color of the clown fish is found on the X chromosome. There is an allele that causes the fish to have a lemon color, which is dominant to a ruby color. Both lemon and ruby are dominant to the white color allele. You notice that regardless for the genetics of preference; if the female fish is lemon she will always prefer the yellow sea anemone. Assume fish follow the sex determination as mammals.

a) What would be the phenotypic outsome of a:

Male cherry fish who prefers red anemones whose dad was homozygous ruby and has preference for green anemones.

X

Female lemon fish that prefers yellow anemones who has the same father as the male fish.

b) Explain how the genetic illustrated above have a fitness advantage for these fish.

1)Mushrooms and other fungi were once lumped in with the plant kingdom. Modern science has separated them into their own kingdom. Kingdom Fungi is distinguished from Kingdom Plantae by the fact that unlike plants fungi.

A)grow a haploid multicellular form from a haploid spore

B)have no cell walls

C)grow, rather than locomote, toward resources

D)are absorptive heterotrophs.

E)have no haploid multicellular stage

2)Members of the Kingdom Fungi are easily distinguished from the Kingdom Plantae because the Fungi

A)Do not have photosynthtic pigments.

B)Are mostly not adapted for living on land

C)Do not have cell walls

D)are primarily unicellular

E)All the above

3)Which of the following would NOT be part of a lichen?

A)chlorophytes

B) zygosporangia

C) basidiocarps

D)Soredia

E)Asci

4)The process of metamorphosis transforms a ______ into a ______________.

A)larva; sexually mature adult

B) blastopore;mouth

C)pseudocoelom; true coelom

D)zygote;blastula

E)blastula;gastrula

5)Which of the following tissues or structures could NOT be derived from ectoderm?

A) all but the digestive tract of a jellyfsh

B) all thin skin of a platyhelminth

C)the brain of a squid

D) the muscles of a nematode

E)your epidermis

6)Which of the following is NOT a characteristic of the phylum Platyhelminthes?

A) true mesodermal tissue

B) cephalization involving concentration of nerve ganglia

C) gas and water exchange is across the thin body wall

D) free living and parasitic form

E) segmentation

7)A triploblastic animal in which the fluid?filled body cavity is only partially lined (lined on one side) with mesodermal tissue is referred to as:

A)coelomate

B)deuterostome

C)acoelomate

D)protostome

E)pseudocoelomate

8)Which of the following groups are diploblastic animals?

A)corals

B) sponges

C) comb jellies

D) a and b

E) a and c

9)Animals that actively move in a unidirectional fashion through their environment would be expected to exhibit which of the following characteristics?

A) bilateral symmetry

B) sponges

C) comb jellies

D) a and b

E) a and c

Which of the following statements is TRUE regarding sea anemones?
None of the answer options is correct.
Sponges—not sea anemones—possess what is considered to be the “simplest” nervous system found in animals.
Because sea anemones are “simple” organisms, these animals only possess motor neurons; sensory neurons or interneurons are never found in sea anemones.
Although sea anemones possess “net-like” nervous systems, these animals have brains located at their bases (near where they would attach to rocks).
Although sea anemones lack definitive brains, they do possess ganglia that serve a similar function to the paired ganglia of flatworms.
2. Some people have low levels of calcium circulating in the blood, a condition known as hypocalcemia. While for many this disorder has little to no effect, for some it can be life-threatening. How could low levels of calcium harm an individual?
Low levels of calcium would not have any effect on synaptic transmission.
Low levels of calcium would cause sustained depolarization of the presynaptic cell.
Low levels of calcium would result in fewer signals sent between the pre- and postsynaptic cell.
3. Cephalization is: the
All of these choices are correct.
development of a brain within the head of an animal.
concentration of sensory organs within the head end of an animal.
development of a “head end” in an organism.
4. Which of the following are TRUE about the resting membrane potential? (Select all that apply.)
It results from voltage-gated sodium channels remaining open for long periods of time.
It results from K+ ions diffusing out of the cell.
It results from the sodium-potassium pump moving more Na+ ions out of the cell than K+ ions into the cell.
5. Afferent and efferent neurons differ in:
their size.
the directionality of the information they send.
their pattern of myelination.
6. A neuron that responds to the environment is a(n):
interneuron.
homeostatic neuron.
motor neuron.
sensory neuron.
7. Which of the following is NOT the role of an interneuron?
stimulating a muscle to contract
conveying information from the internal environment of an animal
relaying information from sensory to motor neurons
maintaining homeostasis
8. Where are postsynaptic cell receptor proteins synthesized?
the Golgi apparatus
the lysosome
the cytoplasm
the rough endoplasmic reticulum
9. Inhibition of the flexor muscle during the knee-extension reflex is an example of:
homeostasis.
reciprocal inhibition.
negative feedback.
All of these choices are correct.
10. What type of cells produce myelin for sensory neurons?
pyramidal neurons
glial cells
melanocytes
astrocytes

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