01:119:116 Lecture Notes - Lecture 5: Meiosis, Cnidaria, Ctenophora

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olivekangaroo435

13 Mar 2016

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Important in the development of animal embryos i: control the expression of many genes that influence morphology, very similar across broad range of taxa, evolution- fig 32. 3. Animals characterized by body plans: particular set of morphological & developmental traits. The arrangement of body structures in relation to the axis of the body: radial- wheel/cylinder shape. Posterior- toward tail: bilateria (most animals, asymmetry- no line will produce roughly equivalent images, embryonic tissue development. Embryos of all eumetazoans becomes layered: germ layers- concentric, embryonic tissue, ectoderm- outer layer, gives rise to outer covering & nervous system in same phyla, endoderm- inner layer, lines archenteron that forms during gastrulation. If cell is removes adult lacks parts: deuterostomes a. b. Radial cleavage- planes parallel/ perpendicular to vertical axis of embryo. Group of cells in the blastula moves inward to form blastopore formation of archenteron: protostomes (first mouth)- blastopore mouth, deuterostomes (second mouth)- blastopore anus.

Related Questions

Do the following characteristics represent a clade or agrade?

1. All animals are heterotrophs.

2. All animals are multicellular.

3. Animals lack rigid cell walls.

4. Animals typically show active movement.

5. Animals are species-rich and diverse in form.

6. Animals occupy all major habitats on earth.

7. Most animals reproduce sexually.

8. Most animals have a characteristic pattern ofdevelopment.

9. Unique Hox development genes (not sponges).

10. Animal cells are organized into tissues.

ultramarineporpoise990

1. Which of the following is NOT true of mycorrhizae?

A) This groupâs name means âfungus rootsâ

B) Plant roots provide mutualistic mycorrhizae with organic nutrients

C) Mycorrhizal fungi may form a mutualistic symbiosis with plants

D) Mycorrhizal fungi provide plants with organic nutrients absorbed from the soil

2. Which of the following terms is INCORRECTLY defined or identified?

A) saprobic fungi-eukaryotic heterotrophs which absorb their nutrients from living organisms

B) plasmogamy-the union of the cytoplasms of two parent mycelia

C) dikaryon-the stage in fungal sexual reproduction in which hyphae contain pairs of haploid nuclei of opposing mating types

D) zygosporangia-the environmentally resistant dikaryotic stage of the Zygomycota

3. In the Kingdom Fungi,

A) a mycelium is a body formed of a network of hyphae

B) a haploid multicellular form alternates with a diploid multicellular form

C) coenocytic hyphae have multiple cross-walls with large pores

D) cell walls are reinforced with proteins similar to collagen

4. Which of the following groups is INCORRECTLY matched with a structure for asexual reproduction?

A) Zygomycota-sporangium(sporangia)

B) Yeast-budding off of new yeast cells

C) Basidiomycota-basidium(basidia)

5. Select the TRUE statement about animal development:

A) Deuterostome development is indeterminate

B) Mesoderm in protostomes arises as outpocketings of the primitive gut

C) In deuterostomes, the blastopore ultimately becomes the mouth of the adult

D) Radial cleavage is characteristic of protostome development

E) All of the above are true

azurecricket62

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

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01:119:116 Lecture Notes - Lecture 5: Meiosis, Cnidaria, Ctenophora

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