Campbell Biology: Concepts & Connections (8th Edition)
8th Edition
ISBN: 9780321885326
Author: Jane B. Reece, Martha R. Taylor, Eric J. Simon, Jean L. Dickey, Kelly A. Hogan
Publisher: PEARSON
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Textbook Question
Chapter 9, Problem 1CC
Connecting the Concepts
1. Complete this concept map to help you review some key concepts of genetics.
Expert Solution & Answer
Summary Introduction
To complete: The given map showing some key concepts of genetics.
Introduction: Genetics forms the basis of heredity. It is the study of genes, inheritance patterns, and their expression leading to various traits in living beings.
Answer to Problem 1CC
The Fig.1 provides the vital concepts of genetics in a nut shell.
Pictorial representation: Fig. 1 shows the completed map key concepts of genetics.
Fig.1:Key concepts of genetics
Explanation of Solution
(a)
Correct answer: Alleles
Explanation: Genes have alternate forms known as alleles. The two alleles of a gene segregate into different gametes and are transmitted to offspring. Hence, the correct answer is alleles.
(b)
Correct answer: Loci
Explanation: Genes are DNA sequences that code for specific traits. The specific position of a gene on a chromosome is known as locus. The plural of locus is loci. Hence, the correct answer is loci.
(c)
Correct answer: Homozygous
Explanation: The alleles of a gene segregate into gametes and transmitted to offspring. They are dominant and recessive alleles. When the two alleles are same in an individual(either dominant or recessive), its genotype is homozygous. Hence, the correct answer is homozygous.
(d)
Correct answer: Dominant
Explanation: Dominance in alleles of a gene occurs when a phenotypic effect of one allele suppresses the phenotypic effect of a second allele. If the two alleles are different in an individual, then the dominant allele out of the two alleles expresses itself and determines the phenotype. Hence, the correct answer is dominant.
(e)
Correct answer: Recessive
Explanation: A dominant allele masks the expression of a second allele. The masked allele is known as recessive because its phenotypic effect is suppressed. Hence, the correct answer is recessive.
(f)
Correct answer: Incomplete dominance
Explanation: Dominance explains how different alleles of a gene express themselves. Some genes show incomplete dominance, which means that individuals with homozygous alleles produce offspring that is intermediate of the two parent alleles. Hence, the correct answer is incomplete dominance.
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Chapter 9 Solutions
Campbell Biology: Concepts & Connections (8th Edition)
Ch. 9 - Connecting the Concepts 1. Complete this concept...Ch. 9 - Whether an allele is dominant or recessive depends...Ch. 9 - Edward was found to be heterozygous (Ss) for...Ch. 9 - Two fruit flies with eyes of the usual red color...Ch. 9 - A man with type B blood and a woman who has type A...Ch. 9 - Tim and Jan both have freckles (see Module 9.9),...Ch. 9 - Both Tim and Jan (problem 6) have a widows peak...Ch. 9 - In rabbits, black hair depends on a dominant...Ch. 9 - A fruit fly with a gray body and red eyes...Ch. 9 - A series of matings shows that the recombination...
Ch. 9 - A couple are both phenotypically normal, but their...Ch. 9 - Why do more men than women have colorblindness?Ch. 9 - In fruit flies, the genes for wing shape and body...Ch. 9 - Adult height in humans is at least partially...Ch. 9 - Heather was surprised to discover she suffered...Ch. 9 - In 1981, a stray black cat with unusual rounded,...Ch. 9 - SCIENTIFIC THINKING The breakthrough that led...
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