Biology
Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 17.5, Problem 1CC
Summary Introduction

To determine:

If it is possible to study the norm of reaction on a population of wild squirrels.

Introduction:

Phenotype is defined as the observable characteristics of an individual. The phenotype is affected by both genetic composition as well as environmental factors. The variation in the phenotype of an individual under different environmental conditions is defined as the ‘norm of the reaction’.

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EXERCISE 5 MENDELIAN TRAITS IN HUMANS 1 While most human traits are polygenic, the traits in the chart below have traditionally been considered Mendelian traits. More recent research has disputed the single-gene nature of some of these traits, but for the purpose of this exercise, assume that the following traits are Mendelian. Work with a partner to help each other determine your own phenotypes and possible genotypes for these traits. Write your answers in the chart. (Note: Refer to the table on p. 62 for information about these traits.) Mendelian Trait Cleft Chin (Dominant) Freckles (Dominant) Attached Earlobes (Recessive) Hitchhiker's Thumb (Recessive) Widow's Peak (Dominant) Your Your Possible Phenotype Genotype(s)
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EXERCISE 6 HARDY-WEINBERG EQUILIBRIUM Work in a small group or alone to complete this exercise. In human population X, consider the simple Mendelian trait for freckles. F is the dominant allele and f'is the recessive allele. Individuals who are homozygous dominant (FF) or heterozygous (F) for the trait express freckles. Individuals who are homozygous recessive (ff) for the trait do not express freckles. In this population, 30% (0.3) of the alleles are recessive (f ) and 70% (0.7) are dominant (F). 1. Use the Hardy-Weinberg equation to determine the genotype frequencies we should expect in the next generation. Be sure to show your work. 2. You have collected data on the observed genotype frequencies of the next generation. They are 60% FF, 30% Ff, and 10% ff. Based on these observations and your expectations, is this trait currently evolving in this population? Why or why not?
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