Microevolution Christopherson What is Microevolution Change in a
- Slides: 30
Microevolution Christopherson
What is Microevolution? Change in a populations alleles over a period of time Calculate allele frequencies
Allele Two different forms of a gene (portion of DNA that codes for a trait)
Three different combinations of Alleles Homozygous Dominant: DD Heterozygous: Dd Homozygous Recessive: dd
Allele Frequencies A measure of how often (frequency) an allele is apparent in a population. Dark Brown=D Tan=d
Allele Frequencies A measure of how often (frequency) an allele is apparent in a population. Dark Brown=D Tan=d Dd dd DD DD dd DD Dd dd dd DD Dd Dd Dd dd DD dd
Allele Frequencies How many D? Dd dd DD DD dd DD Dd dd dd DD Dd Dd Dd dd DD dd
Allele Frequencies How many D? 18 Dd dd DD DD dd DD Dd dd dd DD Dd Dd Dd dd DD dd
Allele Frequencies How many D? 18 How many d? Dd dd DD DD dd DD Dd dd dd DD Dd Dd Dd dd DD dd
Allele Frequencies How many D? 18 How many d? 22 Dd dd DD DD dd DD Dd dd dd DD Dd Dd Dd dd DD dd
Allele Frequencies Gene Pool All of the genes in a population Dd dd DD DD dd DD Dd dd dd DD Dd Dd Dd dd DD dd
What is Natural Selection? “Survival of the Fittest” The best adapted organism will survive and pass traits onto offspring
Natural Selection Flowchart
Observation #1 Every population has the ability to grow
Observation #2 Every population has limited resources
Conclusion #1 Competition for resources Hyena
Observation #3 Every individual in a population is different in structure and behavior. Ex-pattern, speed, agility, etc
Conclusion #2 Natural Selection-Survival of the Fittest: Best adapted organism will survive
Observation #4 Survivors will pass their traits on to their offspring.
Conclusion #3 Evolution has occurred. There could be a change to the population.
Natural Selection Video Watch video. It is a bit long, but has great information. Notice the use of gel electrophoresis. If it doesn’t work, try another browser.
Natural Selection Depends on Two Things 1. Survival An organism must stay alive in a world with disease, predators and limited resources (food, water, territory)
Sarcastic Fringe Head (Watch Video) Due to limited space in the ocean, Fringe Head must “fight” to defend their territory or to obtain food. The Fringe Head that is most fit will obtain or keep the territory.
Orchid Mantis (Watch Video) Orchid mantis uses camouflage to obtain its food. It has adapted over time to blend into orchids.
Cuttlefish (Watch Video) Cuttlefish are just plain amazing. They have adapted to be awesome!
Once an organism survives, it needs to pass along its genes. This leads to #2….
Natural Selection Depends on Two Things 2. Sex Only the “best” organisms or the survivors get the chance to mate and pass on their genes.
Darwin’s Beetle (Watch Video) The male beetle has to fight other males to get to the female. The “Best” male wins. He gets to pass on his genes.
Birds (Watch Video) Male birds have some of the most beautiful colors, elaborate songs, and fancy dances. All of this is to attract a female. It is called sexual selection. The “Best” male wins. He gets to pass on his genes. The bright blue bird is the male. The female is the plain one. She is this way because she will spend time at the nest. If she was bright, predators would see her and eat her eggs or young.
Giant Bullfrog (Watch Video) The male bullfrogs fight for the ladies. The best male wins. He gets to pass on his genes. Frogs undergo external fertilization. The male holds on to the female (typically bigger) and waits for her to lay her eggs. He then deposits his sperm.
- Mr christopherson chemistry
- Agents of microevolution
- Microevolution
- Macroevolution vs microevolution
- Homologous structures
- 3 mechanisms of microevolution
- Hardy weinberg equation
- Define integers
- First order change examples
- Reactive change is change that
- Enagic comp plan
- Is painting a wall a physical change
- Whats chemical change
- Difference between chemical and physical property
- Is chopping wood a chemical or physical change
- What is a physical change
- Physical changes
- How does a physical change differ from a chemical change? *
- Quantity supplied vs supply
- Climate change 2014 mitigation of climate change
- Spare change physical versus chemical change
- Absolute change and relative change formula
- Cake chemical change
- Supply and demand curve shifts
- Rocks change due to temperature and pressure change
- Stage change
- Punnett square for hazel eyes
- Sue wicks
- Behaviour change wheel
- It indicates that you can draw an imaginary line
- Is the ability to do work or cause change.