Occurs when conditions favor those exhibiting one extreme of a phenotypic range. This is common when a populations environment changes of member migrate to a new habitat.
What is Diruptive Selection?
Occurs when conditions favor those at both extremes of a phenotypic range. This could happen from an middle food source disappearing. From avg. seeds to small and large seeds.
What is Stabilizing Selection?
Acts against both extreme phenotypes and favors the middle. This reduces variation and tends to keep status quo.
What is the purpose of sampling with replacement during some of the Hardy-Weinberg lab activities?
To show how random chance does not alter a population over time. This method does not allow gene flow, but does allow for allelic frequency to stay the same.
If chi-square is less than that in the table then?
You have sampled an accurate scenario within your expected results.
Requirements for Hardy-Weinberg?
No Mutations
Random Mating
No Natural Selection
Extremely Large Population size
No Gene Flow
Two compounds that typically surround the cell membrane of bacterial cells?
Lipopolysaccharide
Pertidoglycan
What are the three characteristics used to describe a bacterial COLONY in identifying species of bacteria?
Shapes
Margins
Surface Characteristics
Types of Common colony shapes of bacteria?
Punctiform
Round
Filamentous
Irregular
Types of Common colony margins of bacteria?
Smooth
Curled
Wavy
Lobate-(like an irregular wavy)
Filamentous
Types of Common bacterial colony surface characteristics?
Smooth
Concentric
Wrinkled
Contoured
What are the three basic shapes of bacteria
Bacilli
Cocci
Spirilla
Describe Prokaryotic nature of bacterial Cell.
No true nucleus, no membrane bound organelles, reproduce by binary fission
Plant member from Phylum Bryophyta?
Mosses
Plant member from Phylum Hepatopyta?
Liverworts
Plant member from Phylum Anthoceropyta?
Hornworts
Whisk fern, ferns, horsetails are in phylum?
Pteropyta
Club mosses are in Phylum?
Lycophta
Flowering Plants are in Classification and Phylum?
Class-Angiosperms
Phylum-Anthrophyta
Seed plants are classified as?
Gymnosperms
Conifers are in phylum?
Coniferophyta
Ginkgo is in phylum?
Ginkgophyta
Sporophyte is ____ploid and produces ____ploid spores
Diploid sporophte produces haploid spores.
Spores divide by __________ to produce ____ploid __________
Mitosis to produce haploid gametophyte.
Euglenozoans� an example please
Trypanosoma levisi
Dinoflagellates and paramecia are examples of what group?
Alveolates
Diatoms and brown algae are example of what group?