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Ch. 20 - Population Genetics and Evolution at the Population, Species, and Molecular Levels
Sanders - Genetic Analysis: An Integrated Approach 3rd Edition
Sanders3rd EditionGenetic Analysis: An Integrated ApproachISBN: 9780135564172Not the one you use?Change textbook
Chapter 20, Problem 42d

Put all the candies used in Problems 41 back into a single mound and then divide them into two piles, being sure that the frequencies of each color are the same in each pile. Make a note of the starting frequency of each color. Label one pile 'male' and the other pile 'female.'
When all selection rounds have been completed, combine the two piles and determine the frequency of each color.

Verified step by step guidance
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Step 1: Begin by combining all the candies from Problem 41 into a single mound. Record the starting frequency of each color in the mound. For example, if there are 100 candies and 20 are red, the starting frequency of red is 20/100 = 0.2.
Step 2: Divide the mound into two equal piles, ensuring that the frequency of each color in both piles is the same. For instance, if the starting frequency of red is 0.2, then 20% of the candies in each pile should be red.
Step 3: Label one pile as 'male' and the other as 'female.' These labels will help track the piles during subsequent selection rounds.
Step 4: Perform all the selection rounds as described in the problem or experiment. This may involve processes like random sampling, selection based on specific criteria, or other genetic simulation methods.
Step 5: After completing all selection rounds, combine the 'male' and 'female' piles back into a single mound. Calculate the frequency of each color in the combined mound by dividing the number of candies of each color by the total number of candies. Compare these frequencies to the starting frequencies to observe any changes.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Genetic Frequencies

Genetic frequencies refer to the proportion of different alleles or phenotypes in a population. In this context, it is crucial to understand how to calculate and maintain these frequencies when dividing candies (representing genetic traits) into two piles. This ensures that the genetic diversity is preserved across both 'male' and 'female' groups.
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Genetic Drift

Mendelian Inheritance

Mendelian inheritance is the set of principles that explain how traits are passed from parents to offspring through alleles. Understanding this concept is essential for predicting how the frequencies of different candy colors (traits) will change after selection rounds, as it provides insight into how traits can be inherited and expressed in subsequent generations.
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Selection Pressure

Selection pressure refers to environmental factors that influence which individuals in a population are more likely to survive and reproduce. In the context of the candy problem, recognizing how selection rounds affect the frequencies of candy colors helps in understanding the dynamics of population genetics and how certain traits may become more or less common over time.
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Related Practice
Textbook Question

Put all the candies used in Problems 41 back into a single mound and then divide them into two piles, being sure that the frequencies of each color are the same in each pile. Make a note of the starting frequency of each color. Label one pile 'male' and the other pile 'female.'

Have one person blindly draw one candy from the male pile and one candy from the female pile. Record the colors as though they were genotypes.

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Textbook Question

Put all the candies used in Problems 41 back into a single mound and then divide them into two piles, being sure that the frequencies of each color are the same in each pile. Make a note of the starting frequency of each color. Label one pile 'male' and the other pile 'female.'

If both colors drawn are yellow, eat the candies! If the two colors are any other combination, including yellow with any other color, put the candies back into their respective piles.

399
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Textbook Question

Put all the candies used in Problems 41 back into a single mound and then divide them into two piles, being sure that the frequencies of each color are the same in each pile. Make a note of the starting frequency of each color. Label one pile 'male' and the other pile 'female.'

Repeat this process of blindly drawing one male and one female candy 12 to 15 times for each person in the group.

445
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Textbook Question

Put all the candies used in Problems 41 back into a single mound and then divide them into two piles, being sure that the frequencies of each color are the same in each pile. Make a note of the starting frequency of each color. Label one pile 'male' and the other pile 'female.'

Compare the starting frequency of each color with the frequency after drawing. Describe the observed differences and identify the evolutionary mechanism this exercise best emulates.

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Textbook Question

There are usually five or more colors of candy in each bag. Sort the candies by color, and if your bag has more than four colors, eat the least frequent color or colors. Once that is done, calculate the frequencies of the four remaining colors. Assume these frequencies represent four alleles of a gene, and use the description of the H-W equilibrium for more than two alleles for assistance.

Using a different one of the following variables for each color frequency, write out the expected results of a quadrinomial expansion of the expression (p+q+r+t)².

703
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Textbook Question

There are usually five or more colors of candy in each bag. Sort the candies by color, and if your bag has more than four colors, eat the least frequent color or colors. Once that is done, calculate the frequencies of the four remaining colors. Assume these frequencies represent four alleles of a gene, and use the description of the H-W equilibrium for more than two alleles for assistance.

Use this expansion to calculate the expected frequency of each possible genotype produced in a randomly mating population.

433
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