Biology Topics

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Table 3 Mitosis in Normal Chicken Stomach Cells Phase of Total of Cell Mitosis of Cells Cycle Interphase 440 Prophase Metaphase Anaphase Telophase TOTAL 40 8 2 10 500 100 Time min 625 min

This week you ll be learning about evolution by the process of natural selection and several examples will be given in lecture peppered moth cockroach baits I would like you to research a different example and share it with your classmates Please respond to this post by sharing a specific example of evolution natural selection in nature It can be any kind of living organism 1 provide the name of the organism common name is fine but include the scientific name if possible In a few short sentences describe a trait that has evolved and explain how this trait is advantageous to the 2 organism 3 Please put in your own words or you won t get credit Please include a photo image of your organism you can use the embed image function in the content editor

The gene for snapdragon flower color has two different alleles The Rallele codes for red flowers and the Wallele codes for white flowers This characteristic exhibits incomplete dominance so a mixture of both alleles RW genotype results in a plant with pink flowers A 3 B 3 12 RR C 3 9 WW What is the frequency of the WW genotype in the population shown in the diagram RW

Directions For problems 1 5 analyze the scenario and identify if it is an example of the bottleneck effect the founder effect or gene flow 1 In the nineteenth century northern elephant seals were nearly wiped out by hunters Their population was reduced to only 30 members Conservation efforts have brought those numbers up but due to the decrease in the population the current population of northern elephant seals exhibits little genetic variation 2 A population of blue jays feed on acorns from oak trees During the winter blue jays often have to travel miles to find acorns When they do they take the acorns back to their nests This transfer of acorns from one location to a new location can transfer alleles to other oak tree populations 3 A recent volcanic eruption has separated a group of beetles from their original population This new group of beetles is unable to reconnect with their original population 4 Hurricane Hugo passed throu Puerto Rico in 1989 The hurricane significantly impacted the Puerto Rican Parrot Amazona vittata population A study found that the hurricane wiped out more than half of the parrot s population 5 The building of roads can significantly impact and fragment wildlife populations A study done at Banff National Park in Alberta Canada sought to determine whether or not wildlife crossings can help reduce fragmentation in both grizzly and black bear populations The study found that wildlife crossings allowed bears that were once fragmented from other populations to reconnect Directions For problems 6 10 analyze the scenario and identify if it is an example of directional selection stabilizing selection or disruptive selection 6 Light colored oysters are able to blend into rocks in the shallow water Dark colored oysters are able to blend into rocks that are covered by shadows The intermediate colored oysters are unable to blend into either backdrop and are therefore easily spotted by predators 7 Cacti have two types of predators one that preys on cacti with low numbers of spines and one that preys on cacti with many spines Therefore the most successful cacti are those with an average number of spines 8 After a fire went through a portion of the California chaparral only the darkest colored beetles were able to survive because they could easily blend into their surroundings Both the light and intermediate beetle colors were easily seen by predators 9 After the Industrial Revolution in London England dark colored peppered moths were able to survive best in industrial areas In rural areas however lighter colored moths were able to survive best Intermediate colored moths were unable to survive in either rural or industrial areas 10 Human birth weight averages approximately 3 5 kg 7 5 lb Babies with a lower birth weight tend to have health issues and babies with a higher birth weight tend to have difficulty passing through the birthing canal

My courses SC BIOL1001 M N O The behaviour of a logistica

ne True False

f In which population g Select one The exponent

y winter 2 My courses SC BIOL1001

Humans are changing the biosphere What global changes are occurring that concern biologists and other scientists Select all that may apply Dramatic decrease in human population Dramatically increasing human population Global warming due to decreased carbon dioxide levels Restoration of the ozone layer decreasing global temperatures Depletion of the ozone layer Global climate change due to increased levels of carbon dioxide

Question 1 Not yet A biologist

Question 2 Not yet In populat

14 points Use the word bank to fill in the blanks below not all words will be used The Answer layer protects life on Earth from harmful Answer radiation Humans who are exposed to too much UV radiation may suffer from Answer cataracts and decreased resistance to 9 infrared and Answer producers in all food levels of UV radiation Answer chains are affected by Answer ultraviolet disease phytoplankton mutations 1 ozone Answer Plants skin cancers I high zooplankton 1 I 2

Use the word bank to fill in the blanks below not all words will be used Atmospheric Answer rise when carbon dioxide levels Answer in the atmosphere Earth s atmosphere naturally traps the Answer sun However increased levels of Answer cause more heat to be Answer oxygen an increase in Answer temperatures global warming and is changing world Answer than is normal This causes water vapor increase trapped from the carbon dioxide temperatures decrease heat climates released

Use the word bank to fill in the blanks below not all words will be used Ozone depletion refers to the Answer of the Answer molecules that screen out much of the Answer from the sun The I atmospheric gases Answer the an Answer occurs when certain energy from the Answer leading to t I 1 Answer in atmospheric Answer I destruction 1 I sun ultraviolet radiation greenhouse effect release ozone temperatures increase trap decrease infrared radiation

Match each definition with the word or phrase it describes The naturally occurring gas found in the atmosphere that screens out much of the ultraviolet radiation Earth receives from the sun The warming of Earth that occurs when certain gases trap the energy of the sun in the atmosphere The ozone destroying molecules that human activities release into the atmosphere Describes increases in the average temperature of the biosphere The areas of low ozone concentration that are found over polar regions at certain times of