Postzygotic - Study guides, Class notes & Summaries

Macroevolution changes in a population over very long periods of time. Speciation the splitting of one species into two or more new species Biological Species Concept offers testable way to define a species that does not depend on appearance: The members of a species interbreed and have a shared gene pool, & each species is reproductively isolated from every other species. Gene flow occurs between the populations of a species, but not between pops of diff species. Biolo...

Oliver Ljustina // Exam 1 Bio 107 Questions and Answers Graded A+ macroevolutionary processes Large changes which occur over long time periods and result in new species describe Ernst Mayr said: population or group of populations whose members can interbreed and produce fertile offspring reproductive barrier interruption in courtship, fertilization, embryo formation or offspring developmenreproduct prezygotic barriers barriers occur before the formation of the zygote or fertilized egg...

Which of the following statements about species, as defined by the biological species concept, is (are) correct? I. Biological species are defined by reproductive isolation. II. Biological species are the models used for grouping extinct forms of life. III. The biological species is the largest unit of population in which successful interbreeding is possible. A) I and II B) I and III C) II and III D) I, II, and III - ANSWER-B) I and III There is still some controversy among biologi...

Biology 1108 Unit 1 EXAM Questions and Answers 100% Pass The term "n" refers to the size of a population, that is, the number of individuals in that population. In general, in a sample of n individuals, the frequency of an allele is: A)the number of occurrences of the allele. B)the number of occurrences of the allele divided by n. C)the actual value of n D)the number of occurrences of the allele divided by twice the number of individuals in the sample (2n). E)twice the number of occur...

BIO 202 Exam 1 Questions With Correct Answers Updated 2024/2025 Graded A+. What are the properties of life? - correct answer *Cells and organization *Energy use and metabolism *Environmental response *Regulation and homeostasis *Growth and development *Reproduction *Biological evolution When was earth formed? - correct answer 4.55 billion years ago When did life on earth first appear? - correct answer 3.5 billion years ago What are the evolutionary mechanisms? - correct answer *Nonrando...

BIO 181 Exam 1 (Final Review)Which of the following biological organizations of hierarchical ordered complexity of life is in the correct order? - correct answer Cells, organisms, communities, biosphere. In 2006, eight grizzly bears were found to have DNA traced to one female polar bear. These bears were called, "grolar bears." This is an example of... - correct answer Gene Flow A mule is a hybrid of a donkey and a horse. Mules are sterile and cannot produce offspring, so the only way to...

Bio 311D Exam 2 Dr English To have no change in allele frequencies, you'll need... (H-W assumptions) - 1. No mutations 2. Random mating 3. no heritable advantages 4. enormous population 5. No incoming/outgoing individuals Evolution - change is proportion of alleles in a population Descent with modification - 1. organisms look different today 2. organisms look different than their predecessors 3. that change in appearance is -heritable -adaptive Natural selection means - ...

What best defines a biome? Areas with distinct plant communities and associated with particular climates The distribution of terrestrial biomes across the globe corresponds most to? Climate What is the main source of energy that drives global climate? Solar Energy What are wind circulation patters driven by? The uneven heating of earth's surface What populations does genetic drift have the strongest effects in? Small and isolated What does the biological species concept define a species as...

Biology 1108 Unit 1 EXAM Questions and Answers 100% Pass The term "n" refers to the size of a population, that is, the number of individuals in that population. In general, in a sample of n individuals, the frequency of an allele is: A)the number of occurrences of the allele. B)the number of occurrences of the allele divided by n. C)the actual value of n D)the number of occurrences of the allele divided by twice the number of individuals in the sample (2n). E)twice the number of occur...

SCIN130 Chapter 16 Exam Questions and Answers Which of the following is/are an example(s) of a postzygotic isolating mechanism? - Answer-Hybrid sterility Zygote mortality Two different species attempt to reproduce, but their offspring is unable to undergo proper mitosis because it has two different sets of chromosomes. This type of reproductive barrier is best described as __________ mortality. - Answer-zygote The evolutionary history of a group of organisms is called _____. - Answe...