30 Questions
What defines the two major groups of triploblastic animals?
Number of germ layers
In Deuterostomes, what does the blastopore become?
Anus
Which group of animals exhibits Schizocoely coelom formation?
Earthworms
What is the characteristic that defines animal symmetry?
Correspondence of parts
What is the term used to describe the series of progressive changes in an individual from its beginning to maturity?
Development
Which type of animals are best suited for floating and rolling due to their symmetry?
Spherical forms
During fertilization in marine organisms, what is released by the eggs to attract sperm of the same species?
Chemical molecule
What happens to the sperm after its membranes fuse with the egg during fertilization?
It loses its flagellum
What distinguishes Protostomes from Deuterostomes in terms of blastopore fate?
Mouth becomes the blastopore
What is the term used to describe a solid mass of cells (blastomeres) formed during early development?
Cleavage morula
What is the condition of the embryo when it has 8 to 16 blastomeres?
Morula
In animal development, what key event occurs after fertilization sets in motion important changes in the egg cytoplasm?
Zygote formation
Which type of symmetry is characterized by the body being divided into similar halves by more than 2 planes passing through the longitudinal axis?
Radial symmetry
What is one of the main characteristics associated with bilateral symmetry?
Cephalization
In animal body plans, what does the term 'distal' refer to?
Parts farther from the middle of the body
Which plane divides a bilateral body into dorsal and ventral halves?
Frontal plane
What is a characteristic feature associated with animals exhibiting radial symmetry?
Interaction with the environment in all directions
Which animal falls under the category of organisms exhibiting bilateral symmetry?
Dog
What is the major goal of systematics?
Infer the evolutionary tree that relates all extant and extinct species
What does a scientific name of an animal consist of?
Two words, with the first word being the specific epithet
What is homoplasy in terms of character similarity?
Trait similarity due to convergent evolution
How are taxonomic characters used in phylogenetic reconstruction?
To infer the genetic relationships between organisms
What is a cladogram based on?
Morphological characteristics of species
Why are names of genera required to refer only to a single group of organisms?
To avoid confusion in taxonomic classifications
What is a clade?
A group of species that includes an ancestral species and all its descendants
What is a synapomorphy?
A derived character shared uniquely by all members of a clade
What does a polytomy in a phylogenetic tree represent?
An unresolved pattern of divergence
How do phylogenetic trees help in identifying species?
By providing information about similar characteristics in closely related species
What is the significance of a branch point in a phylogenetic tree?
It shows where lineages diverge
Why is it important for systematists to distinguish between homology and analogy when constructing a phylogeny?
To ensure accurate classification based on shared ancestry or convergent evolution
Test your understanding of the principles of animal development, basic body plans, taxonomy, and phylogeny. Explore the major subdivisions of the animal kingdom and their embryologic features.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
