What is Natural Selection?

Neck of Giraffe. The cups represent the bird’s stomach. And that is NATURAL SELECTION – blobs with advantageous traits (adaptations) passed those traits to their offspring.
Once Darwin’s Origin of Species came out, the ideas of the time changed. Name: Ravi P.
Unit: Biology, Evolution
Natural Selection Lab
Introduction:
Charles Darwin is a naturalist around 1800s that discovered the theory of evolution. When food is adequate, the animals have no problem feeding themselves with foliage. Please answer all questions in full sentences. 1957. Stretching their necks resulted in the adult's neck being slightly longer (than if it had not stretched). Directional Selection. To understand Natural Selection, we must also understand the concepts of descent with modification and common descent.

Modeling Natural Selection Directional Selection. Directional Selection: Mimicry (mimic environment) Stabilizing Selection. Antibiotic resistance of bacteria.

Evolution and Natural Selection Lab (50 points) Type your results and responses to questions in this report and submit. Directional Selection: Mimicry (mimic environment) Stabilizing Selection. Natural selection and local adaptation have been favourite subjects since my doctoral project on ecotypic variation in the annual plant Crepis tectorum. You will study natural selection and mating patterns to see how these forces influence evolution. The only safety concern in this lab is hygiene—students will be consuming crackers as a part of the lab, so it is important that the students wash their hands or clean them with antibacterial hand gel before and after the lab. A female giraffe walks up to a tree with leaves just out of reach. Natural selection is one of the basic mechanisms of evolutionary change (the others are genetic drift, mutation, and migration), and was the central idea first described by Charles Darwin in his seminal work, On the Origin of Species. Describe how the population of animals changed over time. ‘The giraffe’s neck can be used to illustrate how natural selection works on variety within a popula-tion. Ask students to imagine how this same process would work in giraffes so that over time, giraffes would have longer necks. In this lab, you will see how certain adaptations can increase the bird’s chances of acquiring food. Original Population. The accepted theory on giraffe evolution is that the giraffes with the longest necks passed on their genes through natural selection, and that it took millions of years to get the animal we see now. Natural selection favors the average for population selected. Importantly, according to the theory, this trait, longer necks, was transmitted to the giraffe's offspring. Human birth weight. Natural Selection Lab Data Table Questions 1. bird clutch size. Look at the information you recorded in your table for a particular Mutations/ Conditions combination. Activity 1: Breeding Bunnies Complete a hands-on lab simulation of natural selection. bird clutch size. You will then use utensils to pick up food as represented by toothpicks (worms), pennies (bugs), marbles (fruit), and beans (seeds). Giraffe's were originally short necked but each generation the adult giraffes would stretch their necks to reach higher leaves that were left behind. Antibiotic resistance of bacteria. The restriction was food sources.
This interest has continued to the present day. In any group of giraffes, there is always vari-ation in neck length. You will use utensils such as clamps, forceps, chopsticks, and spoons to represent a type of bird beak. Natural selection favors the average for population selected. Human birth weight. Moth color (melanin) Camouflage/Mimicry. She lifts her head and stretches her long neck, barely reaching the green leaves of the tree. This giraffe is pregnant with a baby giraffe. Moth color (melanin) Camouflage/Mimicry. Neck of Giraffe. power of natural selection. Materials: Bag of 15 bean soup (dry beans), cup, 2 Paper lunch bags, paper and pencil. Unformatted text preview: Names: _____ Giraffe Neck Natural Selection and Allelic Frequency Allele Frequency Lab Objectives: To see how natural selection acts on the phenotype rather than the genotype of an organism.To discover that alleles that are lethal in a homozygous individual may be carried in a heterozygous and thus maintained in a gene pool. As she eats more and more leaves off of tall trees, her neck seems to have grown a little bit longer. In this lab, you will demonstrate how natural selection can affect the frequency of a single trait in a population through successive generations. Examples.

Examples. Expand on this with real organisms. An Introduction to Natural Selection. When the extremes of the trait aren’t as well suited . In the 1/AB of natural selection the mutation was larger body and had longer legs.