Evolution Questions and Answers

According to Mendel s law of dominance we would expect have white flowers R red flowers R RR 100 25 R O Rr r white flowers r Rr rr percent of the offspring to

7 Natural selection can t happen without genetic variation The two main sources are and

6 Give your own example of natural selection evolution in nature other than the peppered moth or cockroach baits Explain it in a couple sentences

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

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

Which situation is a result of stabilizing selection in a population A Most kittens are born at an intermediate weight B Environmental changes make spiders with smaller body sizes more common OC Most limpet shells are dark or light in color and not an intermediate shade OD Environmental changes make birds with larger beaks more common FERDEN YE THERMA PORTALE

Natural selection is the pr adapted to their environn

One of the main aims of Dr Marcus s research group at Emory is to recruit people who make sperm who were exposed to PBB s in Michigan and had children with partners who were unexposed What information do they hope to gain from this O An understanding of whether sperm alone can transmit the impacts of PBB exposure on to the next generation O An understanding of whether exposure during pregnancy is more health damaging than exposure during puberty O An understanding of whether the PBB exposures retained in the body can be passed down from pregnant person to the fetus during gestation O An understanding of whether PBBs can persist in the bloodstream for decades or whether they degrade sooner

Scientists describe evolution as the process of change over time In mechanisms must be at work within that population instead of the traits that influence an individual s ability to survive organisms is pretty low So its impact on allele frequencies from one of genes into or out of a population due to either the movement of in by a plant Organisms and gametes that enter a population may hav

Match the following terms to their definition Sexual Dimorphism Founder Effect Bottleneck Effect Speciation Migration

Match the definition to the term Adaptation Artificial Selection Darwin Evolution Natural Selection

LC2 Changes Over The development of antibiotic r Bacteria decide which tra Bacteria cannot reproduc

LC2 Changes Over Time CheckPoint The ears of foxes help to regulate body heat The fennec fox lives in t climates and has small ears that conserve body heat Fenn

1 Amphibians were the first vertebrates to live development of amphibians over time

R Jack o Frost Epis ogenesis 3 Match House to

You performed a bacterial transformation a What did you transform and how b How do you select for bacteria that contain your DNA of interest