Ecology Flashcards
Uniqueness to angiosperms?
Is double fertilization of the egg nucleus and of the central nucleus. One sperm nucleus fertilizes the egg; we from a 2N zygote. Now, the other sperm nucleus fertilizes the two haploid central nuclei forming a 3N endosperm nucleus, which is a nutritive tissue. The endosperm will provide nutrients to developing embryo.
Analogous structures?
Evolved independently and are built from different structures. Insect wings and those of birds are good examples.
Analogous structure share no common ancestor but perform similar functions.
Coordinated behavioral response is known as?
Fixed-action pattern
What does Darwinian fitness refers to?
To the contribution that an individual will make to the gene pool of the next generation. The greater the number of fertile offspring, the more likely darwinian fitness can be measured.
Tundra?
Taiga -> Cold -> Polar Bears
Chaparral
Dominated by dense, spiny shrubs
Gibberellins?
Are plant hormones that may induce certain plants to flower as well as allow stem elongation.
Ethylene?
Stimulates fruit ripening
Abscisic acid?
Is an inhibitor of plant growth hormones
Cytokinins?
Plant hormones involved in cell division.
Blue-Green algae are from which Kingdom?
Kingdom Monera. Also called cyanobacteria.
In lichen
A cyano provides organic nutrients for the fungus, thus they live symbiotically (the fungus offers protection together.
Multiple DNA copies can be made by?
The PCR technique
The most accurate way to work out molecular structures is by
X-Ray diffraction.
Commensalism?
One organism benefits while the other is unharmed
Two types of cell in Xylem and what it does?
Tracheids and vessel members. Xylem conducts water and dissolved mineral absorbed from the soil, and supports the plant. Deposits to make up annual growth rings.
Phloem?
Another vascular tissue consisting of sieve tubes through which sugars and other solutes are conducted
Nitrogen Fixation occurs in which structure of the plant?
The root nodule. As Plants require N2 for growth, they need the help of the legume family(peas, peanuts, soybeans).Inside the bacteria converts N2 into NH3.
Stigma? And Pistil?
The female, “big stick” of the flower
Stamen and Anther?
The male part of the flower, lots of them
If a single ancestral species was to evolve into a variety of forms, this would be an example for…
Adaptive Radiation! Koala and Kangaroo~ exemplifies a divergent evolution.
Assumptions for Hardy-Weinberg Equilibrium?
- No Isolation
- No net migration
- No Natural Selection
- No mutation
- Large population
- Random mating
-There should be no change in the gene pool of a population!
This law shows us how a genotype and phenotype stability can be achieved in a population. It examines population gene pools, not genotypes of individuals.
What did Darwin never do.
He never suggested that variation in traits are due to mutation. He was too old for that! Or dead. He lacked the understanding of genetics.
In Canis Lupus,
Canis is the genus; lupus is the species. THis is a gray wolf.
Early earth had reducing atmosphere of
NH3, H2S and CH4
