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Questions and Answers
What characteristics are associated with a protostome?
What characteristics are associated with a protostome?
- Radial cleavage and indeterminate cell fate, with the anus forming first.
- Spiral cleavage and determinate cell fate, with the mouth forming first. (correct)
- Spiral cleavage and indeterminate cell fate, with the mouth forming first.
- Radial cleavage and determinate cell fate, with the mouth forming first.
Which of the following best describes the process of natural selection?
Which of the following best describes the process of natural selection?
- The study of similar characteristics between related species.
- The differential survival and reproduction of individuals based on heritable traits. (correct)
- The advantage of heterozygotes over homozygotes in a population.
- The process where random mutations increase the genetic variation.
Which mechanism significantly contributes to genetic diversity through the formation of gametes?
Which mechanism significantly contributes to genetic diversity through the formation of gametes?
- Asexual reproduction of offspring.
- The action of DNA repair enzymes to fix mutations.
- The reduction of UV exposure using suncreen
- The independent assortment of chromosomes during meiosis. (correct)
In the context of evolutionary biology, how is the concept of fitness best defined?
In the context of evolutionary biology, how is the concept of fitness best defined?
A severe environmental event dramatically reduces population size which causes a change in allele frequencies. What is this example of?
A severe environmental event dramatically reduces population size which causes a change in allele frequencies. What is this example of?
Which of the following is a term for a cytoplasmic projection used for locomotion in some protists?
Which of the following is a term for a cytoplasmic projection used for locomotion in some protists?
Anatomically, which plane separates the dorsal and ventral portions of an animal?
Anatomically, which plane separates the dorsal and ventral portions of an animal?
A phylogenetic group that includes a common ancestor but not all of its descendants is classified as:
A phylogenetic group that includes a common ancestor but not all of its descendants is classified as:
In a rabbit population, a new colony has been established after rabbits swam across a river and interbred. What is the most likely mechanism of evolution in this scenario?
In a rabbit population, a new colony has been established after rabbits swam across a river and interbred. What is the most likely mechanism of evolution in this scenario?
Which of these is a fundamental inference made by Darwin about the process of natural selection?
Which of these is a fundamental inference made by Darwin about the process of natural selection?
Flashcards
Protostome Development
Protostome Development
In protostomes, the mouth forms first and cell fate is determinate.
Natural Selection
Natural Selection
The process where some phenotypes survive and reproduce better than others.
Genetic Diversity Creation
Genetic Diversity Creation
Independent assortment of chromosomes leads to genetic diversity during gamete formation.
Fitness in Evolution
Fitness in Evolution
Fitness refers to an organism's ability to reproduce effectively in its environment.
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Bottleneck Effect
Bottleneck Effect
A drastic reduction in population size leads to a loss of genetic diversity.
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Cytoplasmic streaming
Cytoplasmic streaming
Locomotion in some protists using movement of cytoplasm.
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Dorsal and ventral division
Dorsal and ventral division
An anatomical plane separating an animal into back and belly.
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Paraphyletic clade
Paraphyletic clade
A group from a single ancestor excluding some descendants.
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Gene flow
Gene flow
Evolutionary mechanism when individuals interbreed between populations.
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Syncytial hypothesis
Syncytial hypothesis
Proposes multicellular animals arose from a multinucleate cell.
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General Biology II - Winter 2025 Exam 1
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Protostomes: Characterized by spiral, determinate cleavage, and mouth formation preceding the anus.
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Survival: Survival of certain phenotypes compared to others, followed by successful reproduction, is a key aspect of natural selection.
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Genetic Diversity: Independent assortment of chromosomes during gamete formation is a primary mechanism for generating genetic variation.
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Estimated Number of Described Animals: Approximately 1.5 million species of animals have been described and named to date.
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Fitness: Fitness is defined as the ability of an organism to survive and reproduce relative to other organisms in the population. This includes survival of the strongest, ability to reproduce, and ability to spread one allele relative to another.
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Bottleneck Effect: A strong event that dramatically reduces the size of a population, thus reducing genetic diversity. A drastic loss of genetic variation occurs.
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Prepare for your Winter 2025 General Biology II Exam 1 with this comprehensive quiz covering key concepts such as protostomes, natural selection, genetic diversity, and the bottleneck effect. Evaluate your understanding and readiness to tackle these fundamental topics in biology. Good luck!